You are developing an application that includes a class named Order. The application will store a collection of Order objects.
The collection must meet the following requirements:
• Use strongly typed members.
• Process Order objects in first-in-first-out order.
• Store values for each Order object.
• Use zero-based indices.
You need to use a collection type that meets the requirements.
Which collection type should you use?
- A . Queue<T>
- B . SortedList
- C . LinkedList<T>
- D . HashTable
- E . Array<T>
A
Explanation:
Queues are useful for storing messages in the order they were received for sequential processing. Objects stored in a Queue<T> are inserted at one end and removed from the other.
Reference: http://msdn.microsoft.com/en-us/library/7977ey2c.aspx
You are developing an application. The application calls a method that returns an array of integers named employeeIds. You define an integer variable named employeeIdToRemove and assign a value to it. You declare an array named filteredEmployeeIds.
You have the following requirements:
• Remove duplicate integers from the employeeIds array.
• Sort the array in order from the highest value to the lowest value.
• Remove the integer value stored in the employeeIdToRemove variable from the employeeIds array.
You need to create a LINQ query to meet the requirements.
Which code segment should you use?
- A . Option A
- B . Option B
- C . Option C
- D . Option D
C
Explanation:
The Distinct keyword avoids duplicates, and OrderByDescending provides the proper ordering from highest to lowest.
You are developing an application that includes the following code segment. (Line numbers are included for reference only.)
The GetAnimals() method must meet the following requirements:
• Connect to a Microsoft SQL Server database.
• Create Animal objects and populate them with data from the database.
• Return a sequence of populated Animal objects.
You need to meet the requirements.
Which two actions should you perform? (Each correct answer presents part of the solution. Choose two.)
- A . Insert the following code segment at line 16:
while(sqlDataReader.NextResult()) - B . Insert the following code segment at line 13:
sqlConnection.Open(); - C . Insert the following code segment at line 13:
sqlConnection.BeginTransaction(); - D . Insert the following code segment at line 16:
while(sqlDataReader.Read()) - E . Insert the following code segment at line 16:
while(sqlDataReader.GetValues())
B, D
Explanation:
B: SqlConnection.Open – Opens a database connection with the property settings specified by the
ConnectionString.
Reference: http://msdn.microsoft.com/en-us/library/system.data.sqlclient.sqlconnection.open.aspx
D: SqlDataReader.Read – Advances the SqlDataReader to the next record. Reference: http://msdn.microsoft.com/en-us/library/system.data.sqlclient.sqldatareader.read.aspx
DRAG DROP
You are developing a custom collection named LoanCollection for a class named Loan class.
You need to ensure that you can process each Loan object in the LoanCollection collection by using a foreach loop.
How should you complete the relevant code? (To answer, drag the appropriate code segments to the correct locations in the answer area. Each code segment may be used once, more than once, or not at all. You may need to drag the split bar between panes or scroll to view content.)
You are developing an application that uses the Microsoft ADO.NET Entity Framework to retrieve order information from a Microsoft SQL Server database.
The application includes the following code. (Line numbers are included for reference only.)
The application must meet the following requirements:
• Return only orders that have an OrderDate value other than null.
• Return only orders that were placed in the year specified in the OrderDate property or in a later year.
You need to ensure that the application meets the requirements.
Which code segment should you insert at line 08?
- A . Where order.OrderDate.Value != null && order.OrderDate.Value.Year > = year
- B . Where order.OrderDate.Value = = null && order.OrderDate.Value.Year = = year
- C . Where order.OrderDate.HasValue && order.OrderDate.Value.Year = = year
- D . Where order.OrderDate.Value.Year = = year
A
Explanation:
• For the requirement to use an OrderDate value other than null use:
OrderDate.Value != null
• For the requirement to use an OrderDate value for this year or a later year use: OrderDate.Value>= year
DRAG DROP
You are developing an application by using C#. The application includes an array of decimal values named loanAmounts. You are developing a LINQ query to return the values from the array.
The query must return decimal values that are evenly divisible by two. The values must be sorted from the lowest value to the highest value.
You need to ensure that the query correctly returns the decimal values.
How should you complete the relevant code? (To answer, drag the appropriate code segments to the correct locations in the answer area. Each code segment may be used once, more than once, or not at all. You may need to drag the split bar between panes or scroll to view content.)
Explanation:
Note: In a query expression, the orderby clause causes the returned sequence or subsequence (group) to be sorted in either ascending or descending order.
Examples:
// Query for ascending sort.
IEnumerable<string> sortAscendingQuery =
from fruit in fruits
orderby fruit //"ascending" is default
select fruit;
// Query for descending sort.
IEnumerable<string> sortDescendingQuery =
from w in fruits
orderby w descending
select w;
You are developing an application. The application includes a method named ReadFile that reads data from a file.
The ReadFile() method must meet the following requirements:
• It must not make changes to the data file.
• It must allow other processes to access the data file.
• It must not throw an exception if the application attempts to open a data file that does not exist.
You need to implement the ReadFile() method.
Which code segment should you use?
- A . var fs = File.Open(Filename, FileMode.OpenOrCreate, FileAccess.Read,FileShare.ReadWrite);
- B . var fs = File.Open(Filename, FileMode.Open, FileAccess.Read,FileShare.ReadWrite);
- C . var fs = File.Open(Filename, FileMode.OpenOrCreate, FileAccess.Read,FileShare.Write);
- D . var fs = File.ReadAllLines(Filename);
- E . var fs = File.ReadAllBytes(Filename);
A
Explanation:
FileMode.OpenOrCreate – Specifies that the operating system should open a file if it exists; otherwise, a new file should be created. If the file is opened with FileAccess.Read, FileIOPermissionAccess.Read permission is required. If the file access is FileAccess.Write, FileIOPermissionAccess.Write permission is required. If the file is opened with FileAccess.ReadWrite, both FileIOPermissionAccess.Read and FileIOPermissionAccess.Write permissions are required.
http://msdn.microsoft.com/en-us/library/system.io.filemode.aspx
FileShare.ReadWrite – Allows subsequent opening of the file for reading or writing.If this flag is not specified, any request to open the file for reading or writing (by this process or another process) will fail until the file is closed.However, even if this flag is specified, additional permissions might still be needed to access the file.
http://msdn.microsoft.com/pl-pl/library/system.io.fileshare.aspx
An application receives JSON data in the following format:
The application includes the following code segment. (Line numbers are included for reference only.)
You need to ensure that the ConvertToName() method returns the JSON input string as a Name object.
Which code segment should you insert at line 10?
- A . Return ser.ConvertToType<Name>(json);
- B . Return ser.DeserializeObject(json);
- C . Return ser.Deserialize<Name>(json);
- D . Return (Name)ser.Serialize(json);
C
Explanation:
JavaScriptSerializer.Deserialize<T> – Converts the specified JSON string to an object of type T.
http://msdn.microsoft.com/en-us/library/bb355316.aspx
DRAG DROP
An application serializes and deserializes XML from streams.
The XML streams are in the following format:
The application reads the XML streams by using a DataContractSerializer object that is declared by the following code segment:
You need to ensure that the application preserves the element ordering as provided in the XML stream.
How should you complete the relevant code? (To answer, drag the appropriate attributes to the correct locations in the answer area-Each attribute may be used once, more than once, or not at all. You may need to drag the split bar between panes or scroll to view content.)
Explanation:
Target 1: The DataContractAttribute.Namespace Property gets or sets the namespace for the data contract for the type. Use this property to specify a particular namespace if your type must return data that complies with a specific data contract.
Target2, target3: We put Order=10 on FirstName to ensure that LastName is ordered first.
Note:
The basic rules for data ordering include:
* If a data contract type is a part of an inheritance hierarchy, data members of its base types are always first in the order.
* Next in order are the current type’s data members that do not have the Order property of the DataMemberAttribute attribute set, in alphabetical order.
* Next are any data members that have the Order property of the DataMemberAttribute attribute set. These are ordered by the value of the Order property first and then alphabetically if there is more than one member of a certain Order value. Order values may be skipped.
Reference: Data Member Order
https://msdn.microsoft.com/en-us/library/ms729813(v=vs.110).aspx
Reference: DataContractAttribute.Namespace Property
https://msdn.microsoft.com/en-us/library/system.runtime.serialization.datacontractattribute.namespace(v=vs.110).aspx
You are developing an application. The application converts a Location object to a string by using a method named WriteObject. The WriteObject() method accepts two parameters, a Location object and an XmlObjectSerializer object.
The application includes the following code. (Line numbers are included for reference only.)
You need to serialize the Location object as a JSON object.
Which code segment should you insert at line 20?
- A . New DataContractSerializer(typeof(Location))
- B . New XmlSerializer(typeof(Location))
- C . New NetDataContractSenalizer()
- D . New DataContractJsonSerializer(typeof(Location))
D
Explanation:
The code is using [DataContract] attribute here so need to use DataContractSerializer class.
The DataContractJsonSerializer class serializes objects to the JavaScript Object Notation (JSON) and deserializes JSON data to objects.
Use the DataContractJsonSerializer class to serialize instances of a type into a JSON document and to deserialize a JSON document into an instance of a type.
An application includes a class named Person. The Person class includes a method named GetData.
You need to ensure that the GetData() from the Person class.
Which access modifier should you use for the GetData() method?
- A . Internal
- B . Protected
- C . Private
- D . Protected internal
- E . Public
B
Explanation:
Protected – The type or member can be accessed only by code in the same class or structure, or in a class that is derived from that class.
The protected keyword is a member access modifier. A protected member is accessible within its class and by derived class instances.
Reference: http://msdn.microsoft.com/en-us/library/ms173121.aspx
You are developing an application by using C#.
The application includes the following code segment. (Line numbers are included for reference only.)
The DoWork() method must not throw any exceptions when converting the obj object to the IDataContainer interface or when accessing the Data property.
You need to meet the requirements.
Which code segment should you insert at line 07?
- A . var dataContainer = (IDataContainer)obj;
- B . dynamic dataContainer = obj;
- C . var dataContainer = obj is IDataContainer;
- D . var dataContainer = obj as IDataContainer;
D
Explanation:
As – The as operator is like a cast operation.
However, if the conversion isn’t possible, as returns null instead of raising an exception.
http://msdn.microsoft.com/en-us/library/cscsdfbt(v=vs.110).aspx
You are creating an application that manages information about zoo animals. The application includes a class named Animal and a method named Save.
The Save () method must be strongly typed. It must allow only types inherited from the Animal class that uses a constructor that accepts no parameters.
You need to implement the Save () method.
Which code segment should you use?
- A . Option A
- B . Option B
- C . Option C
- D . Option D
C
Explanation:
The condition new () ensures the empty/default constructor and must be the last condition.
When you define a generic class, you can apply restrictions to the kinds of types that client code can use for type arguments when it instantiates your class. If client code tries to instantiate your class by using a type that is not allowed by a constraint, the result is a compile-time error. These restrictions are called constraints. Constraints are specified by using the where contextual keyword.
http://msdn.microsoft.com/en-us/library/d5x73970.aspx
DRAG DROP
You are developing a class named ExtensionMethods.
You need to ensure that the ExtensionMethods class implements the IsEmail() method on string objects.
How should you complete the relevant code? (To answer, drag the appropriate code segments to the correct locations in the answer area. Each code segment may be used once, more than once, or not at all. You may need to drag the split bar between panes or scroll to view content.)
Explanation:
Extensions must be in a static class as it kind of a shared source of extension methods. You do not instantiate the class.
The key word “this” is simply a syntax how you tell the compiler, that your method IsUrl is extension for the String object
You are developing an application. The application includes classes named Employee and Person and an interface named IPerson.
The Employee class must meet the following requirements:
• It must either inherit from the Person class or implement the IPerson interface.
• It must be inheritable by other classes in the application.
You need to ensure that the Employee class meets the requirements.
Which two code segments can you use to achieve this goal? (Each correct answer presents a complete solution. Choose two.)
- A . Option A
- B . Option B
- C . Option C
- D . Option D
B, D
Explanation:
Sealed – When applied to a class, the sealed modifier prevents other classes from inheriting from it.
Reference: http://msdn.microsoft.com/en-us/library/88c54tsw(v=vs.110).aspx
You are developing an application that will convert data into multiple output formats.
The application includes the following code. (Line numbers are included for reference only.)
You are developing a code segment that will produce tab-delimited output.
All output routines implement the following interface:
You need to minimize the completion time of the GetOutput() method.
Which code segment should you insert at line 06?
- A . Option A
- B . Option B
- C . Option C
- D . Option D
B
Explanation:
A String object concatenation operation always creates a new object from the existing string and the new data.
A StringBuilder object maintains a buffer to accommodate the concatenation of new data. New data is appended to the buffer if room is available; otherwise, a new, larger buffer is allocated, data from the original buffer is copied to the new buffer, and the new data is then appended to the new buffer.
The performance of a concatenation operation for a String or StringBuilder object depends on the frequency of memory allocations. A String concatenation operation always allocates memory, whereas a StringBuilder concatenation operation allocates memory only if the StringBuilder object buffer is too small to accommodate the new data. Use the String class if you are concatenating a fixed number of String objects. In that case, the compiler may even combine individual concatenation operations into a single operation. Use a StringBuilder object if you are concatenating an arbitrary number of strings; for example, if you’re using a loop to concatenate a random number of strings of user input.
http://msdn.microsoft.com/en-us/library/system.text.stringbuilder(v=vs.110).aspx
You are developing an application by using C#.
The application includes an object that performs a long running process.
You need to ensure that the garbage collector does not release the object’s resources until the process completes.
Which garbage collector method should you use?
- A . ReRegisterForFinalize()
- B . SuppressFinalize()
- C . Collect()
- D . WaitForFullGCApproach()
B
Explanation:
You can use the SuppressFinalize method in a resource class to prevent a redundant garbage collection from being called.
Reference: GC.SuppressFinalize Method (Object)
https://msdn.microsoft.com/en-us/library/system.gc.suppressfinalize(v=vs.110).aspx
You are creating a class named Employee. The class exposes a string property named EmployeeType.
The following code segment defines the Employee class. (Line numbers are included for reference only.)
The EmployeeType property value must be accessed and modified only by code within the Employee class or within a class derived from the Employee class.
You need to ensure that the implementation of the EmployeeType property meets the requirements.
Which two actions should you perform? (Each correct answer represents part of the complete solution. Choose two.)
- A . Replace line 05 with the following code segment: protected get;
- B . Replace line 06 with the following code segment: private set;
- C . Replace line 03 with the following code segment: public string EmployeeType
- D . Replace line 05 with the following code segment: private get;
- E . Replace line 03 with the following code segment: protected string EmployeeType
- F . Replace line 06 with the following code segment: protected set;
BE
Explanation:
protected string EmpType { get; private set;}
This is a quite common way to work with properties within base classes.
Incorrect:
Not D: Cannot be used because of the internal keyword on line 03.
You are implementing a method named Calculate that performs conversions between value types and reference types.
The following code segment implements the method. (Line numbers are included for reference only.)
You need to ensure that the application does not throw exceptions on invalid conversions.
Which code segment should you insert at line 04?
- A . int balance = (int) (float)amountRef;
- B . int balance = (int)amountRef;
- C . int balance = amountRef;
- D . int balance = (int) (double) amountRef;
A
Explanation:
Explicit cast of object into float, and then another Explicit cast of float into int.
Reference: explicit (C# Reference)
https://msdn.microsoft.com/en-us/library/xhbhezf4.aspx
You are creating a console application by using C#.
You need to access the application assembly.
Which code segment should you use?
- A . Assembly.GetAssembly(this);
- B . this.GetType();
- C . Assembly.Load();
- D . Assembly.GetExecutingAssembly();
D
Explanation:
Assembly.GetExecutingAssembly – Gets the assembly that contains the code that is currently executing.
Reference: http://msdn.microsoft.com/en-us/library/system.reflection.assembly.getexecutingassembly(v=vs.110).aspx
Incorrect:
Not A: Assembly.GetAssembly – Gets the currently loaded assembly in which the specified class is defined.
http://msdn.microsoft.com/en-us/library/system.reflection.assembly.getassembly.aspx
HOTSPOT
You are implementing a library method that accepts a character parameter and returns a string.
If the lookup succeeds, the method must return the corresponding string value. If the lookup fails, the method must return the value "invalid choice."
You need to implement the lookup algorithm.
How should you complete the relevant code? (To answer, select the correct keyword in each drop-down list in the answer area.)
Explanation:
switch(letter)
{
case ‘a’:
case ‘m’:
default:
}
Reference: switch (C# Reference)
http://msdn.microsoft.com/en-us/library/06tc147t(v=vs.110).aspx
You use the Task.Run() method to launch a long-running data processing operation. The data processing operation often fails in times of heavy network congestion.
If the data processing operation fails, a second operation must clean up any results of the first operation.
You need to ensure that the second operation is invoked only if the data processing operation throws an unhandled exception.
What should you do?
- A . Create a TaskCompletionSource<T> object and call the TrySetException() method of the object.
- B . Create a task by calling the Task.ContinueWith() method.
- C . Examine the Task.Status property immediately after the call to the Task.Run() method.
- D . Create a task inside the existing Task.Run() method by using the AttachedToParent option.
B
Explanation:
Task.ContinueWith – Creates a continuation that executes asynchronously when the target Task
completes.The returned Task will not be scheduled for execution until the current task has completed, whether it completes due to running to completion successfully, faulting due to an unhandled exception, or exiting out early due to being canceled.
http://msdn.microsoft.com/en-us/library/dd270696.aspx
You are modifying an application that processes leases.
The following code defines the Lease class. (Line numbers are included for reference only.)
Leases are restricted to a maximum term of 5 years. The application must send a notification message if a lease request exceeds 5 years.
You need to implement the notification mechanism.
Which two actions should you perform? (Each correct answer presents part of the solution. Choose two.)
- A . Option A
- B . Option B
- C . Option C
- D . Option D
- E . Option E
- F . Option F
You are developing an application that uses structured exception handling. The application includes a class named ExceptionLogger.
The ExceptionLogger class implements a method named LogException by using the following code segment:
public static void LogException(Exception ex)
You have the following requirements:
• Log all exceptions by using the LogException() method of the ExceptionLogger class.
• Rethrow the original exception, including the entire exception stack.
You need to meet the requirements.
Which code segment should you use?
- A . Option A
- B . Option B
- C . Option C
- D . Option D
A
Explanation:
Once an exception is thrown, part of the information it carries is the stack trace. The stack trace is a list of the method call hierarchy that starts with the method that throws the exception and ends with the method that catches the exception. If an exception is re-thrown by specifying the exception in the throw statement, the stack trace is restarted at the current method and the list of method calls between the original method that threw the exception and the current method is lost. To keep the original stack trace information with the exception, use the throw statement without specifying the exception.
Reference: http://msdn.microsoft.com/en-us/library/ms182363(v=vs.110).aspx
You are developing an application that includes a class named UserTracker.
The application includes the following code segment. (Line numbers are included for reference only.)
You need to add a user to the UserTracker instance.
What should you do?
- A . Option A
- B . Option B
- C . Option C
- D . Option D
DRAG DROP
You develop an application that displays information from log files when errors occur. The application will prompt the user to create an error report that sends details about the error and the session to the administrator.
When a user opens a log file by using the application, the application throws an exception and closes.
The application must preserve the original stack trace information when an exception occurs during this process.
You need to implement the method that reads the log files.
How should you complete the relevant code? (To answer, drag the appropriate code segments to the correct locations in the answer area. Each code segment may be used once, more than once, or not at all. You may need to drag the split bar between panes or scroll to view content.)
Explanation:
StreamReader – Implements a TextReader that reads characters from a byte stream in a particular encoding.
Reference: http://msdn.microsoft.com/en-us/library/system.io.streamreader(v=vs.110).aspx
Once an exception is thrown, part of the information it carries is the stack trace. The stack trace is a list of the method call hierarchy that starts with the method that throws the exception and ends with the method that catches the exception. If an exception is re-thrown by specifying the exception in the throw statement, the stack trace is restarted at the current method and the list of method calls between the original method that threw the exception and the current method is lost. To keep the original stack trace information with the exception, use the throw statement without specifying the exception.
Reference: http://msdn.microsoft.com/en-us/library/ms182363(v=vs.110).aspx
Incorrect:
StringReader – Implements a TextReader that reads from a string.
Reference: http://msdn.microsoft.com/en-us/library/system.io.stringreader(v=vs.110).aspx
DRAG DROP
You are developing an application that includes a class named Kiosk. The Kiosk class includes a static property named Catalog.
The Kiosk class is defined by the following code segment. (Line numbers are included for reference only.)
You have the following requirements:
• Initialize the _catalog field to a Catalog instance.
• Initialize the _catalog field only once.
• Ensure that the application code acquires a lock only when the _catalog object must be instantiated.
You need to meet the requirements.
Which three code segments should you insert in sequence at line 09? (To answer, move the appropriate code segments from the list of code segments to the answer area and arrange them in the correct order.)
Explanation:
After taking a lock you must check once again the _catalog field to be sure that other threads didn’t instantiated it in the meantime.
DRAG DROP
You are developing an application that will include a method named GetData. The GetData() method will retrieve several lines of data from a web service by using a System.IO.StreamReader object.
You have the following requirements:
• The GetData() method must return a string value that contains the first line of the response from the web service.
• The application must remain responsive while the GetData() method runs.
You need to implement the GetData() method.
How should you complete the relevant code? (To answer, drag the appropriate objects to the correct locations in the answer area. Each object may be used once, more than once, or not at all. You may need to drag the split bar between panes or scroll to view content.)
Explanation:
Box 1. async Box 2. await Box 3. ReadLineAsync();
Incorrect:
Not Box 3: ReadToEndAsync() is not correct since only the first line of the response is required.
You are adding a public method named UpdateScore to a public class named ScoreCard.
The code region that updates the score field must meet the following requirements:
• It must be accessed by only one thread at a time.
• It must not be vulnerable to a deadlock situation.
You need to implement the UpdateScore() method.
What should you do?
- A . Option A
- B . Option B
- C . Option C
- D . Option D
B
Explanation:
Because the class is public, you need a private lock Object.
Reference: lock vs. MethodImplOptions.Synchronized [Kit George]
http://blogs.msdn.com/b/bclteam/archive/2004/01/20/60719.aspx
DRAG DROP
You are developing an application that implements a set of custom exception types.
You declare the custom exception types by using the following code segments:
The application includes a function named DoWork that throws .NET Framework exceptions and custom exceptions.
The application contains only the following logging methods:
The application must meet the following requirements:
• When AdventureWorksValidationException exceptions are caught, log the information by using the static void Log (AdventureWorksValidationException ex) method.
• When AdventureWorksDbException or other AdventureWorksException exceptions are caught, log the information by using the static void I oq( AdventureWorksException ex) method.
You need to meet the requirements.
How should you complete the relevant code? (To answer, drag the appropriate code segments to the correct locations in the answer area. Each code segment may be used once, more than once, or not at all. You may need to drag the split bar between panes or scroll to view content.)
Explanation:
Go from the most specific exception to the least on.
So the order would be:
DRAG DROP
You are developing an application that implements a set of custom exception types.
You declare the custom exception types by using the following code segments:
The application includes a function named DoWork that throws .NET Framework exceptions and custom exceptions.
The application contains only the following logging methods:
The application must meet the following requirements:
• When AdventureWorksValidationException exceptions are caught, log the information by using the static void Log (AdventureWorksValidationException ex) method.
• When AdventureWorksDbException or other AdventureWorksException exceptions are caught, log the information by using the static void I oq( AdventureWorksException ex) method.
You need to meet the requirements.
How should you complete the relevant code? (To answer, drag the appropriate code segments to the correct locations in the answer area. Each code segment may be used once, more than once, or not at all. You may need to drag the split bar between panes or scroll to view content.)
Explanation:
Go from the most specific exception to the least on.
So the order would be:
DRAG DROP
You are developing an application that implements a set of custom exception types.
You declare the custom exception types by using the following code segments:
The application includes a function named DoWork that throws .NET Framework exceptions and custom exceptions.
The application contains only the following logging methods:
The application must meet the following requirements:
• When AdventureWorksValidationException exceptions are caught, log the information by using the static void Log (AdventureWorksValidationException ex) method.
• When AdventureWorksDbException or other AdventureWorksException exceptions are caught, log the information by using the static void I oq( AdventureWorksException ex) method.
You need to meet the requirements.
How should you complete the relevant code? (To answer, drag the appropriate code segments to the correct locations in the answer area. Each code segment may be used once, more than once, or not at all. You may need to drag the split bar between panes or scroll to view content.)
Explanation:
Go from the most specific exception to the least on.
So the order would be:
DRAG DROP
You are developing an application that implements a set of custom exception types.
You declare the custom exception types by using the following code segments:
The application includes a function named DoWork that throws .NET Framework exceptions and custom exceptions.
The application contains only the following logging methods:
The application must meet the following requirements:
• When AdventureWorksValidationException exceptions are caught, log the information by using the static void Log (AdventureWorksValidationException ex) method.
• When AdventureWorksDbException or other AdventureWorksException exceptions are caught, log the information by using the static void I oq( AdventureWorksException ex) method.
You need to meet the requirements.
How should you complete the relevant code? (To answer, drag the appropriate code segments to the correct locations in the answer area. Each code segment may be used once, more than once, or not at all. You may need to drag the split bar between panes or scroll to view content.)
Explanation:
Go from the most specific exception to the least on.
So the order would be:
You are developing a C# application that has a requirement to validate some string input data by using the Regex class.
The application includes a method named ContainsHyperlink. The ContainsHyperlink() method will verify the presence of a URI and surrounding markup.
The following code segment defines the ContainsHyperlink() method. (Line numbers are included for reference only.)
The expression patterns used for each validation function are constant.
You need to ensure that the expression syntax is evaluated only once when the Regex object is initially instantiated.
Which code segment should you insert at line 04?
- A . Option A
- B . Option B
- C . Option C
- D . Option D
D
Explanation:
RegexOptions.Compiled – Specifies that the regular expression is compiled to an assembly.This yields faster execution but increases startup time.This value should not be assigned to the Options property when calling the CompileToAssembly method.
http://msdn.microsoft.com/en-us/library/system.text.regularexpressions.regexoptions.aspx
Additional info
http://stackoverflow.com/questions/513412/how-does-regexoptions-compiled-work
You are developing an application by using C#.
You have the following requirements:
• Support 32-bit and 64-bit system configurations.
• Include pre-processor directives that are specific to the system configuration.
• Deploy an application version that includes both system configurations to testers.
• Ensure that stack traces include accurate line numbers.
You need to configure the project to avoid changing individual configuration settings every time you deploy the application to testers.
Which two actions should you perform? (Each correct answer presents part of the solution. Choose two.)
- A . Update the platform target and conditional compilation symbols for each application configuration.
- B . Create two application configurations based on the default Release configuration.
- C . Optimize the application through address rebasing in the 64-bit configuration.
- D . Create two application configurations based on the default Debug configuration.
A, D
Explanation:
A: “include pre-processor directives that are specific to the system configuration”
system configuration here refers to bitness ie 32-bit or 64-bit
so the developer wants to use in code different pre-processor directives for 32/64 bit,
this is achieved by defining and using conditional compilation symbols for different platform targets (platform target is VS term for bitness ie for 32/64 bit).
D (not B): The question about testing, debugging, stack trace, line numbers etc. There is not a single word about release
You are developing a method named CreateCounters that will create performance counters for an application.
The method includes the following code. (Line numbers are included for reference only.)
You need to ensure that Counter1 is available for use in Windows Performance Monitor (PerfMon).
Which code segment should you insert at line 16?
- A . CounterType = PerformanccCounterType.RawBase
- B . CounterType = PerformanceCounterType.AverageBase
- C . CounterType = PerformanceCounterType.SampleBase
- D . CounterType = PerformanceCounterType.CounterMultiBase
C
Explanation:
Note SampleFraction on line 9. The Base counter type SampleBase has the Parent (composite) counter type SampleFraction.
Reference: PerformanceCounterType Enumeration
http://msdn.microsoft.com/en-us/library/system.diagnostics.performancecountertype.aspx
You are developing an application that will transmit large amounts of data between a client computer and a server.
You need to ensure the validity of the data by using a cryptographic hashing algorithm.
Which algorithm should you use?
- A . HMACSHA256
- B . RNGCryptoServiceProvider
- C . DES
- D . Aes
A
Explanation:
The .NET Framework provides the following classes that implement hashing algorithms:
• HMACSHA1.
• MACTripleDES.
• MD5CryptoServiceProvider.
• RIPEMD160.
• SHA1Managed.
• SHA256Managed.
• SHA384Managed.
• SHA512Managed.
HMAC variants of all of the Secure Hash Algorithm (SHA), Message Digest 5 (MD5), and RIPEMD-160 algorithms.
CryptoServiceProvider implementations (managed code wrappers) of all the SHA algorithms.
Cryptography Next Generation (CNG) implementations of all the MD5 and SHA algorithms.
Reference: http://msdn.microsoft.com/en-us/library/92f9ye3s.aspx#hash_values
DRAG DROP
You are testing an application. The application includes methods named CalculateInterest and LogLine. The CalculateInterest() method calculates loan interest. The LogLine() method sends diagnostic messages to a console window.
You have the following requirements:
• The CalculateInterest() method must run for all build configurations.
• The LogLine() method must be called only for debug builds.
You need to ensure that the methods run correctly.
How should you complete the relevant code? (To answer, drag the appropriate code segments to the correct locations in the answer area. Each code segment may be used once, more than once, or not at all. You may need to drag the split bar between panes or scroll to view content.)
Explanation:
When the C# compiler encounters an #if directive, followed eventually by an #endif directive, it will compile the code between the directives only if the specified symbol is defined. Unlike C and C++, you cannot assign a numeric value to a symbol; the #if statement in C# is Boolean and only tests whether the symbol has been defined or not. For example,
#define DEBUG
#if DEBUG
Console.WriteLine("Debug version");
#endif
Reference: http://stackoverflow.com/questions/2104099/c-sharp-if-then-directives-for-debug-vs-release
You are developing an assembly that will be used by multiple applications.
You need to install the assembly in the Global Assembly Cache (GAC).
Which two actions can you perform to achieve this goal? (Each correct answer presents a complete solution. Choose two.)
- A . Use the Assembly Registration tool (regasm.exe) to register the assembly and to copy the assembly to the GAC.
- B . Use the Strong Name tool (sn.exe) to copy the assembly into the GAC.
- C . Use Microsoft Register Server (regsvr32.exe) to add the assembly to the GAC.
- D . Use the Global Assembly Cache tool (gacutil.exe) to add the assembly to the GAC.
- E . Use Windows Installer 2.0 to add the assembly to the GAC.
D, E
Explanation:
There are two ways to deploy an assembly into the global assembly cache:
* Use an installer designed to work with the global assembly cache. This is the preferred option for installing assemblies into the global assembly cache.
* Use a developer tool called the Global Assembly Cache tool (Gacutil.exe), provided by the Windows
Software Development Kit (SDK).
Note:
In deployment scenarios, use Windows Installer 2.0 to install assemblies into the global assembly cache. Use the Global Assembly Cache tool only in development scenarios, because it does not provide assembly reference counting and other features provided when using the Windows Installer.
http://msdn.microsoft.com/en-us/library/yf1d93sz%28v=vs.110%29.aspx
You are debugging an application that calculates loan interest.
The application includes the following code. (Line numbers are included for reference only.)
You need to ensure that the debugger breaks execution within the CalculateInterest() method when the loanAmount variable is less than or equal to zero in all builds of the application.
What should you do?
- A . Insert the following code segment at line 03: Trace.Assert(loanAmount > 0);
- B . Insert the following code segment at line 03: Debug.Assert(loanAmount > 0);
- C . Insert the following code segment at line 05: Debug.Write(loanAmount > 0);
- D . Insert the following code segment at line 05: Trace.Write(loanAmount > 0);
A
Explanation:
By default, the Debug.Assert method works only in debug builds. Use the Trace.Assert method if you want to do assertions in release builds. For more information, see Assertions in Managed Code. http://msdn.microsoft.com/en-us/library/kssw4w7z.aspx
Incorrect:
Not B: Debug.Assert only works in debug mode. Here it must work in all builds of the application.
You are developing an application that accepts the input of dates from the user.
Users enter the date in their local format. The date entered by the user is stored in a string variable named inputDate. The valid date value must be placed in a DateTime variable named validatedDate.
You need to validate the entered date and convert it to Coordinated Universal Time (UTC). The code must not cause an exception to be thrown.
Which code segment should you use?
- A . Option A
- B . Option B
- C . Option C
- D . Option D
A
Explanation:
AdjustToUniversal parses s and, if necessary, converts it to UTC.
Note: The DateTime.TryParse method converts the specified string representation of a date and time to its DateTime equivalent using the specified culture-specific format information and formatting style, and returns a value that indicates whether the conversion succeeded.
DRAG DROP
You are developing an application by using C#. The application will process several objects per second.
You need to create a performance counter to analyze the object processing.
Which three actions should you perform in sequence? (To answer, move the appropriate actions from the list of actions to the answer area and arrange them in the correct order.)
Explanation:
CounterCreationDataCollection counterDataCollection = new CounterCreationDataCollection(); // Box1
// Add the counter. Box 1
CounterCreationData averageCount64 = new CounterCreationData();
averageCount64.CounterType = PerformanceCounterType.AverageCount64;
averageCount64.CounterName = "AverageCounter64Sample";
counterDataCollection.Add(averageCount64);
// Add the base counter.
CounterCreationData averageCount64Base = new CounterCreationData();
averageCount64Base.CounterType = PerformanceCounterType.AverageBase;
averageCount64Base.CounterName = "AverageCounter64SampleBase";
counterDataCollection.Add(averageCount64Base); // Box 2
// Create the category. Box 3
PerformanceCounterCategory.Create("AverageCounter64SampleCategory",
"Demonstrates usage of the AverageCounter64 performance counter type.",
PerformanceCounterCategoryType.SingleInstance, counterDataCollection);
You are developing an application by using C#. You provide a public key to the development team during development.
You need to specify that the assembly is not fully signed when it is built.
Which two assembly attributes should you include in the source code? (Each correct answer presents part of the solution. Choose two.)
- A . AssemblyKeyNameAttribute
- B . ObfuscateAssemblyAttribute
- C . AssemblyDelaySignAttribute
- D . AssemblyKeyFileAttribute
C, D
Explanation:
* AssemblyDelaySignAttribute
Specifies that the assembly is not fully signed when created.
* The following code example shows the use of the AssemblyDelaySignAttribute attribute
with the AssemblyKeyFileAttribute.
using System;
using System.Reflection;
[assembly:AssemblyKeyFileAttribute(“TestPublicKey.snk”)]
[assembly:AssemblyDelaySignAttribute(true)]
namespace DelaySign
{
public class Test { }
}
Reference: http://msdn.microsoft.com/en-us/library/t07a3dye(v=vs.110).aspx
DRAG DROP
You are developing an application that includes a class named Warehouse. The Warehouse class includes a static property named Inventory.
The Warehouse class is defined by the following code segment. (Line numbers are included for reference only.)
You have the following requirements:
• Initialize the _inventory field to an Inventory instance.
• Initialize the _inventory field only once.
• Ensure that the application code acquires a lock only when the _inventory object must be instantiated.
You need to meet the requirements.
Which three code segments should you insert in sequence at line 09? (To answer, move the appropriate code segments from the list of code segments to the answer area and arrange them in the correct order.)
Explanation:
After taking a lock you must check once again the _inventory field to be sure that other threads didn’t instantiated it in the meantime.
First, you check if the inventory is null, if so, you lock it to avoid other threads to change it.
Second, you check again for the null, as in the tiny millisecond between check for null and locking could another thread get it.
Finally you create the instance and release the lock.
You are adding a public method named UpdateGrade to a public class named ReportCard.
The code region that updates the grade field must meet the following requirements:
• It must be accessed by only one thread at a time.
• It must not be vulnerable to a deadlock situation.
You need to implement the UpdateGrade() method.
What should you do?
- A . Option A
- B . Option B
- C . Option C
- D . Option D
A
Explanation:
Because the class is public, you need a private lock Object.
Incorrect:
Not B, not C: Once the ReportCard is public, other process can lock on type or instance.
So, these options are leaning to a DEADLOCK.
Not D: [MethodImpl] attribute works locking on type (for static members) or on the instance(for instance members). It could cause a DEADLOCK.
Reference: https://msdn.microsoft.com/en-us/library/c5kehkcz.aspx
You are developing an application that includes a class named BookTracker for tracking library books.
The application includes the following code segment. (Line numbers are included for reference only.)
You need to add a user to the BookTracker instance.
What should you do?
- A . Option A
- B . Option B
- C . Option C
- D . Option D
DRAG DROP
You are implementing a method that creates an instance of a class named User. The User class contains a public event named Renamed.
The following code segment defines the Renamed event:
Public event EventHandler<RenameEventArgs> Renamed;
You need to create an event handler for the Renamed event by using a lambda expression.
How should you complete the relevant code? (To answer, drag the appropriate code segments to the correct locations in the answer area. Each code segment may be used once, more than once, or not at all. You may need to drag the split bar between panes or scroll to view content.)
You are creating a console application by using C#.
You need to access the assembly found in the file named car.dll.
Which code segment should you use?
- A . Assembly.Load();
- B . Assembly.GetExecutingAssembly();
- C . This.GetType();
- D . Assembly.LoadFile("car.dll");
D
Explanation:
Assembly.LoadFile – Loads the contents of an assembly file on the specified path.
http://msdn.microsoft.com/en-us/library/b61s44e8.aspx
You are developing an application by using C#.
The application includes an object that performs a long running process.
You need to ensure that the garbage collector does not release the object’s resources until the process completes.
Which garbage collector method should you use?
- A . WaitForFullGCComplete()
- B . WaitForFullGCApproach()
- C . KeepAlive()
- D . WaitForPendingFinalizers()
C
Explanation:
The GC.KeepAlive method references the specified object, which makes it ineligible for garbage collection from the start of the current routine to the point where this method is called.
The purpose of the KeepAlive method is to ensure the existence of a reference to an object that is at risk of being prematurely reclaimed by the garbage collector.
The KeepAlive method performs no operation and produces no side effects other than extending the lifetime of the object passed in as a parameter.
Reference: GC.KeepAlive Method (Object)
https://msdn.microsoft.com/en-us/library/system.gc.keepalive(v=vs.110).aspx
An application includes a class named Person. The Person class includes a method named GetData.
You need to ensure that the GetData() method can be used only by the Person class and not by any class derived from the Person class.
Which access modifier should you use for the GetData() method?
- A . Public
- B . Protected internal
- C . Internal
- D . Private
- E . Protected
B
Explanation:
The protected keyword is a member access modifier. A protected member is accessible within its class and by derived class instances.
You are creating an application that manages information about your company’s products. The application includes a class named Product and a method named Save.
The Save() method must be strongly typed. It must allow only types inherited from the Product class that use a constructor that accepts no parameters.
You need to implement the Save() method.
Which code segment should you use?
- A . Option A
- B . Option B
- C . Option C
- D . Option D
D
Explanation:
The condition new() ensures the empty/default constructor and must be the last condition.
When you define a generic class, you can apply restrictions to the kinds of types that client code can use for type arguments when it instantiates your class. If client code tries to instantiate your class by using a type that is not allowed by a constraint, the result is a compile-time error. These restrictions are called constraints.
Constraints are specified by using the where contextual keyword.
http://msdn.microsoft.com/en-us/library/d5x73970.aspx
DRAG DROP
You are developing an application by using C#. The application will output the text string "First Line" followed by the text string "Second Line".
You need to ensure that an empty line separates the text strings.
Which four code segments should you use in sequence? (To answer, move the appropriate code segments to the answer area and arrange them in the correct order.)
You are developing an application. The application includes classes named Mammal and Animal and an interface named IAnimal.
The Mammal class must meet the following requirements:
• It must either inherit from the Animal class or implement the IAnimal interface.
• It must be inheritable by other classes in the application.
You need to ensure that the Mammal class meets the requirements.
Which two code segments can you use to achieve this goal? (Each correct answer presents a complete solution. Choose two.)
- A . Option A
- B . Option B
- C . Option C
- D . Option D
A, C
Explanation:
When applied to a class, the sealed modifier prevents other classes from inheriting from it.
Reference: http://msdn.microsoft.com/en-us/library/88c54tsw(v=vs.110).aspx
DRAG DROP
You are developing a class named ExtensionMethods.
You need to ensure that the ExtensionMethods class implements the IsEmail() extension method on string objects.
How should you complete the relevant code? (To answer, drag the appropriate code segments to the correct locations in the answer area. Each code segment may be used once, more than once, or not at all. You may need to drag the split bar between panes or scroll to view content.)
Explanation:
Extensions must be in a static class as it kind of a shared source of extension methods. You do not instantiate the class.
The key word “this” is simply a syntax how you tell the compiler, that your method IsUrl is extension for the String object
You are developing an application by using C#.
The application includes the following code segment. (Line numbers are included for reference only.)
The DoWork() method must throw an InvalidCastException exception if the obj object is not of type IDataContainer when accessing the Data property.
You need to meet the requirements.
Which code segment should you insert at line 07?
- A . var dataContainer = (IDataContainer) obj;
- B . var dataContainer = obj as IDataContainer;
- C . var dataContainer = obj is IDataContainer;
- D . dynamic dataContainer = obj;
A
Explanation:
direct cast. If object is not of the given type, an InvalidCastException is thrown.
Incorrect:
Not B: If obj is not of the given type, result is null.
Not C: If obj is not of a given type, result is false.
Not D: This simply check the variable during runtime. It will not throw an exception.
Reference: http://msdn.microsoft.com/en-us/library/ms173105.aspx
An application receives JSON data in the following format:
The application includes the following code segment. (Line numbers are included for reference only.)
You need to ensure that the ConvertToName() method returns the JSON input string as a Name object.
Which code segment should you insert at line 10?
- A . Return ser.Desenalize (json, typeof(Name));
- B . Return ser.ConvertToType<Name>(json);
- C . Return ser.Deserialize<Name>(json);
- D . Return ser.ConvertToType (json, typeof (Name));
C
Explanation:
JavaScriptSerializer.Deserialize<T> – Converts the specified JSON string to an object of type T.
http://msdn.microsoft.com/en-us/library/bb355316.aspx
You are developing an application that includes the following code segment. (Line numbers are included for reference only.)
The GetCustomers() method must meet the following requirements:
• Connect to a Microsoft SQL Server database.
• Populate Customer objects with data from the database.
• Return an IEnumerable<Customer> collection that contains the populated Customer objects.
You need to meet the requirements.
Which two actions should you perform? (Each correct answer presents part of the solution. Choose two.)
- A . Insert the following code segment at line 17: while (sqlDataReader.GetValues())
- B . Insert the following code segment at line 14: sqlConnection.Open();
- C . Insert the following code segment at line 14: sqlConnection.BeginTransaction();
- D . Insert the following code segment at line 17: while (sqlDataReader.Read())
- E . Insert the following code segment at line 17: while (sqlDataReader.NextResult())
B, D
Explanation:
B: SqlConnection.Open – Opens a database connection with the property settings specified by the
ConnectionString.
Reference: http://msdn.microsoft.com/en-us/library/system.data.sqlclient.sqlconnection.open.aspx
D: SqlDataReader.Read – Advances the SqlDataReader to the next record.
Reference: http://msdn.microsoft.com/en-us/library/system.data.sqlclient.sqldatareader.read.aspx
Not E: reader.NextResult is wrong because that is used when reader has more than one result set (SP or inline SQL has more than one Select).
DRAG DROP
You are developing an application that includes a class named Customer.
The application will output the Customer class as a structured XML document by using the following code segment:
You need to ensure that the Customer class will serialize to XML.
How should you complete the relevant code? (To answer, drag the appropriate code segments to the correct locations in the answer area. Each code segment may be used once, more than once, or not at all. You may need to drag the split bar between panes or scroll to view content.)
Explanation:
http://msdn.microsoft.com/en-us/library/3dkta8ya.aspx
An application will upload data by using HTML form-based encoding. The application uses a method named SendMessage.
The SendMessage() method includes the following code. (Line numbers are included for reference only.)
The receiving URL accepts parameters as form-encoded values.
You need to send the values intA and intB as form-encoded values named a and b, respectively.
Which code segment should you insert at line 04?
- A . Option A
- B . Option B
- C . Option C
- D . Option D
D
Explanation:
WebClient.UploadValuesTaskAsync – Uploads the specified name/value collection to the resource identified by the specified URI as an asynchronous operation using a task object. These methods do not block the calling thread.
http://msdn.microsoft.com/en-us/library/system.net.webclient.uploadvaluestaskasync.aspx
You are developing an application. The application converts a Location object to a string by using a method named WriteObject.
The WriteObject() method accepts two parameters, a Location object and an XmlObjectSerializer object.
The application includes the following code. (Line numbers are included for reference only.)
You need to serialize the Location object as XML.
Which code segment should you insert at line 20?
- A . new XmlSerializer(typeof(Location))
- B . new NetDataContractSerializer()
- C . new DataContractJsonSerializer(typeof (Location))
- D . new DataContractSerializer(typeof(Location))
D
Explanation:
The code is using [DataContract] attribute here so need to use DataContractSerializer class.
The DataContractJsonSerializer class serializes objects to the JavaScript Object Notation
(JSON) and deserializes JSON data to objects.
Use the DataContractJsonSerializer class to serialize instances of a type into a JSON
document and to deserialize a JSON document into an instance of a type.
You are developing an application that includes a class named Order. The application will store a collection of Order objects.
The collection must meet the following requirements:
• Internally store a key and a value for each collection item.
• Provide objects to iterators in ascending order based on the key.
• Ensure that item are accessible by zero-based index or by key.
You need to use a collection type that meets the requirements.
Which collection type should you use?
- A . LinkedList
- B . Queue
- C . Array
- D . HashTable
- E . SortedList
E
Explanation:
SortedList<TKey, TValue> – Represents a collection of key/value pairs that are sorted by key based on the associated IComparer<T> implementation.
http://msdn.microsoft.com/en-us/library/ms132319.aspx
You are developing an application that includes the following code segment. (Line numbers are included for reference only.)
You need to ensure that the application accepts only integer input and prompts the user each time non-integer input is entered.
Which code segment should you add at line 19?
- A . If (!int.TryParse(sLine, out number))
- B . If ((number = Int32.Parse(sLine)) == Single.NaN)
- C . If ((number = int.Parse(sLine)) > Int32.MaxValue)
- D . If (Int32.TryParse(sLine, out number))
A
Explanation:
Incorrect:
Not B, not C: These will throw exception when user enters non-integer value.
Not D: This is exactly the opposite what we want to achieve.
Int32.TryParse – Converts the string representation of a number to its 32-bit signed integer equivalent. A return value indicates whether the conversion succeeded. http://msdn.microsoft.com/en-us/library/f02979c7.aspx
You are debugging an application that calculates loan interest.
The application includes the following code. (Line numbers are included for reference only.)
You have the following requirements:
• The debugger must break execution within the Calculatelnterest() method when the loanAmount variable is less than or equal to zero.
• The release version of the code must not be impacted by any changes.
You need to meet the requirements.
What should you do?
- A . Insert the following code segment at tine 05:
Debug.Write(loanAmount > 0); - B . Insert the following code segment at line 05:
Trace.Write(loanAmount > 0); - C . Insert the following code segment at line 03:
Debug.Assert(loanAmount > 0); - D . Insert the following code segment at line 03:
Trace.Assert(loanAmount > 0);
C
Explanation:
By default, the Debug.Assert method works only in debug builds. Use the Trace.Assert method if you want to do assertions in release builds. For more information, see Assertions in Managed Code.
http://msdn.microsoft.com/en-us/library/kssw4w7z.aspx
You are developing an application that will process orders. The debug and release versions of the application will display different logo images.
You need to ensure that the correct image path is set based on the build configuration.
Which code segment should you use?
- A . Option A
- B . Option B
- C . Option C
- D . Option D
C
Explanation:
There is no such constraint (unless you define one explicitly) RELEASE. http://stackoverflow.com/questions/507704/will-if-release-work-like-if-debug-does-in-c
You are testing an application. The application includes methods named CalculateInterest and LogLine. The CalculateInterest() method calculates loan interest. The LogLine() method sends diagnostic messages to a console window.
The following code implements the methods. (Line numbers are included for reference only.)
You have the following requirements:
• The Calculatelnterest() method must run for all build configurations.
• The LogLine() method must run only for debug builds.
You need to ensure that the methods run correctly.
What are two possible ways to achieve this goal? (Each correct answer presents a complete solution. Choose two.)
- A . Insert the following code segment at line 01:
#region DEBUG
Insert the following code segment at line 10:
#endregion - B . Insert the following code segment at line 10:
[Conditional("DEBUG")] - C . Insert the following code segment at line 05:
#region DEBUG
Insert the following code segment at line 07:
#endregion - D . Insert the following code segment at line 01:
#if DE30G
Insert the following code segment at line 10:
#endif - E . Insert the following code segment at line 01:
[Conditional(MDEBUG")] - F . Insert the following code segment at line 05:
#if DEBUG
Insert the following code segment at line 07:
#endif - G . Insert the following code segment at line 10:
[Conditional("RELEASE")]
B, F
Explanation:
#if DEBUG: The code in here won’t even reach the IL on release.
[Conditional("DEBUG")]: This code will reach the IL, however the calls to the method will not execute unless DEBUG is on.
http://stackoverflow.com/questions/3788605/if-debug-vs-conditionaldebug
You are developing a method named CreateCounters that will create performance counters for an application.
The method includes the following code. (Line numbers are included for reference only.)
You need to ensure that Counter2 is available for use in Windows Performance Monitor (PerfMon).
Which code segment should you insert at line 16?
- A . CounterType = PerformanceCounterType.RawBase
- B . CounterType = PerformanceCounterType.AverageBase
- C . CounterType = PerformanceCounterType.SampleBase
- D . CounterType = PerformanceCounterType.CounterMultiBase
B
Explanation:
Note AverageTimer32 on line 09. The Base counter type AverageBase has the Parent (composite) counter types AverageTimer32, AverageCount64.
Reference:
http://msdn.microsoft.com/en-us/library/system.diagnostics.performancecountertype.aspx
You are developing an application that will transmit large amounts of data between a client computer and a server. You need to ensure the validity of the data by using a cryptographic hashing algorithm.
Which algorithm should you use?
- A . ECDsa
- B . RNGCryptoServiceProvider
- C . Rfc2898DeriveBytes
- D . HMACSHA512
D
Explanation:
The HMACSHA512 class computes a Hash-based Message Authentication Code (HMAC) using the SHA512 hash function.
Reference: https://msdn.microsoft.com/en-us/library/system.security.cryptography.hmacsha512(v=vs.110).aspx
You are developing an application by using C#.
The application includes an object that performs a long running process.
You need to ensure that the garbage collector does not release the object’s resources until the process completes.
Which garbage collector method should you use?
- A . WaitForFullGCComplete()
- B . SuppressFinalize()
- C . collect()
- D . RemoveMemoryPressure()
B
Explanation:
You can use the SuppressFinalize method in a resource class to prevent a redundant garbage collection from being called.
Reference: GC.SuppressFinalize Method (Object)
https://msdn.microsoft.com/en-us/library/system.gc.suppressfinalize(v=vs.110).aspx
You are implementing a method named FloorTemperature that performs conversions between value types and reference types.
The following code segment implements the method. (Line numbers are included for reference only.)
You need to ensure that the application does not throw exceptions on invalid conversions.
Which code segment should you insert at line 04?
- A . int result = (int)degreesRef;
- B . int result = (int)(double)degreesRef;
- C . int result = degreesRef;
- D . int result = (int)(float)degreesRef;
You are developing an application by using C#.
The application includes an object that performs a long running process.
You need to ensure that the garbage collector does not release the object’s resources until the process completes.
Which garbage collector method should you use?
- A . WaitForFullGCComplete()
- B . SuppressFinalize()
- C . WaitForFullGCApproach()
- D . WaitForPendingFinalizers()
Explanation:
B
Explanation:
You can use the SuppressFinalize method in a resource class to prevent a redundant garbage collection from being called.
Reference: GC.SuppressFinalize Method (Object)
https://msdn.microsoft.com/en-us/library/system.gc.suppressfinalize(v=vs.110).aspx
DRAG DROP
You are developing an application that implements a set of custom exception types.
You declare the custom exception types by using the following code segments:
The application includes a function named DoWork that throws .NET Framework exceptions and custom exceptions.
The application contains only the following logging methods:
The application must meet the following requirements:
• When ContosoValidationException exceptions are caught, log the information by using the static void Log (ContosoValidationException ex) method.
• When ContosoDbException or other ContosoException exceptions are caught, log the information by using the static void Log(ContosoException ex) method.
You need to meet the requirements.
How should you complete the relevant code? (To answer, drag the appropriate code segments to the correct locations in the answer area. Each code segment may be used once, more than once, or not at all. You may need to drag the split bar between panes or scroll to view content.)
Explanation:
Catch the most specific exception first.
You are developing an application that uses structured exception handling. The application includes a class named Logger.
The Logger class implements a method named Log by using the following code segment:
public static void Log(Exception ex) { }
You have the following requirements:
• Log all exceptions by using the Log() method of the Logger class.
• Rethrow the original exception, including the entire exception stack.
You need to meet the requirements.
Which code segment should you use?
- A . Option A
- B . Option B
- C . Option C
- D . Option D
DRAG DROP
You are developing an application that will include a method named GetData. The GetData() method will retrieve several lines of data from a web service by using a System.IO.StreamReader object.
You have the following requirements:
• The GetData() method must return a string value that contains the entire response from the web service.
• The application must remain responsive while the GetData() method runs.
You need to implement the GetData() method.
How should you complete the relevant code? (To answer, drag the appropriate objects to the correct locations in the answer area. Each object may be used once, more than once, or not at all. You may need to drag the split bar between panes or scroll to view content.)
Explanation:
Incorrect:
Not Box 3: ReadToEndAsync() is not correct since only the first line of the response is required.
You are developing an application that includes a class named BookTracker for tracking library books.
The application includes the following code segment. (Line numbers are included for reference only.)
You need to add a book to the BookTracker instance.
What should you do?
- A . Option A
- B . Option B
- C . Option C
- D . Option D
You use the Task.Run() method to launch a long-running data processing operation. The data processing operation often fails in times of heavy network congestion.
If the data processing operation fails, a second operation must clean up any results of the first operation.
You need to ensure that the second operation is invoked only if the data processing operation throws an unhandled exception.
What should you do?
- A . Create a task within the operation, and set the Task.StartOnError property to true.
- B . Create a TaskFactory object and call the ContinueWhenAll() method of the object.
- C . Create a task by calling the Task.ContinueWith() method.
- D . Use the TaskScheduler class to create a task and call the TryExecuteTask() method on the class.
C
Explanation:
Task.ContinueWith – Creates a continuation that executes asynchronously when the target Task
completes.The returned Task will not be scheduled for execution until the current task has completed, whether it completes due to running to completion successfully, faulting due to an unhandled exception, or exiting out early due to being canceled.
http://msdn.microsoft.com/en-us/library/dd270696.aspx
You are developing an application by using C#. You provide a public key to the development team during development.
You need to specify that the assembly is not fully signed when it is built.
Which two assembly attributes should you include in the source code? (Each correct answer presents part of the solution. Choose two.)
- A . AssemblyFlagsAttribute
- B . AssemblyKeyFileAttribute
- C . AssemblyConfigurationAttribute
- D . AssemblyDelaySignAttribute
B, D
Explanation:
* AssemblyDelaySignAttribute
Specifies that the assembly is not fully signed when created.
* The following code example shows the use of the AssemblyDelaySignAttribute attribute
with the AssemblyKeyFileAttribute.
using System;
using System.Reflection;
[assembly:AssemblyKeyFileAttribute(“TestPublicKey.snk”)]
[assembly:AssemblyDelaySignAttribute(true)]
namespace DelaySign
{
public class Test { }
}
Reference: http://msdn.microsoft.com/en-us/library/t07a3dye(v=vs.110).aspx
You are developing an application that will transmit large amounts of data between a client computer and a server. You need to ensure the validity of the data by using a cryptographic hashing algorithm.
Which algorithm should you use?
- A . RSA
- B . HMACSHA256
- C . Aes
- D . RNGCryptoServiceProvider
B
Explanation:
The HMACSHA256 class computes a Hash-based Message Authentication Code (HMAC) by using the SHA256 hash function.
Reference: https://msdn.microsoft.com/en-us/library/system.security.cryptography.hmacsha256(v=vs.110).aspx
You are developing an application that uses the Microsoft ADO.NET Entity Framework to retrieve order information from a Microsoft SQL Server database.
The application includes the following code. (Line numbers are included for reference only.)
The application must meet the following requirements:
• Return only orders that have an OrderDate value other than null.
• Return only orders that were placed in the year specified in the year parameter.
You need to ensure that the application meets the requirements.
Which code segment should you insert at line 08?
- A . Option A
- B . Option B
- C . Option C
- D . Option D
You are creating an application that manages information about your company’s products. The application includes a class named Product and a method named Save.
The Save() method must be strongly typed. It must allow only types inherited from the Product class that use a constructor that accepts no parameters.
You need to implement the Save() method.
Which code segment should you use?
- A . Option A
- B . Option B
- C . Option C
- D . Option D
D
Explanation:
The condition new() ensures the empty/default constructor and must be the last condition.
When you define a generic class, you can apply restrictions to the kinds of types that client code can use for type arguments when it instantiates your class. If client code tries to instantiate your class by using a type that is not allowed by a constraint, the result is a compile-time error. These restrictions are called constraints.
Constraints are specified by using the where contextual keyword.
http://msdn.microsoft.com/en-us/library/d5x73970.aspx
You are creating a class named Employee. The class exposes a string property named EmployeeType.
The following code segment defines the Employee class. (Line numbers are included for reference only.)
The EmployeeType property value must meet the following requirements:
• The value must be accessed only by code within the Employee class or within a class derived from the Employee class.
• The value must be modified only by code within the Employee class.
You need to ensure that the implementation of the EmployeeType property meets the requirements.
Which two actions should you perform? (Each correct answer represents part of the complete solution. Choose two.)
- A . Replace line 03 with the following code segment: public string EmployeeType
- B . Replace line 06 with the following code segment: protected set;
- C . Replace line 05 with the following code segment: private get;
- D . Replace line 05 with the following code segment: protected get;
- E . Replace line 03 with the following code segment: protected string EmployeeType
- F . Replace line 06 with the following code segment: private set;
E, F
Explanation:
Incorrect:
Not D: Cannot be used because of the internal keyword on line 03.
You are developing an application by using C#.
The application includes an object that performs a long running process.
You need to ensure that the garbage collector does not release the object’s resources until the process completes.
Which garbage collector method should you use?
- A . RemoveMemoryPressure()
- B . ReRegisterForFinalize()
- C . WaitForFullGCComplete()
- D . KeepAlive()
D
Explanation:
The purpose of the KeepAlive method is to ensure the existence of a reference to an object that is at risk of being prematurely reclaimed by the garbage collector.
Reference: GC.KeepAlive Method (Object)
https://msdn.microsoft.com/en-us/library/system.gc.keepalive(v=vs.110).aspx
You are developing an application that will transmit large amounts of data between a client computer and a server. You need to ensure the validity of the data by using a cryptographic hashing algorithm.
Which algorithm should you use?
- A . RSA
- B . Aes
- C . HMACSHA256
- D . DES
DRAG DROP
You are developing an application by using C#. The application will process several objects per second.
You need to create a performance counter to analyze the object processing.
Which three actions should you perform in sequence? (To answer, move the appropriate actions from the list of actions to the answer area and arrange them in the correct order.)
Explanation:
Note:
: Example:
CounterCreationDataCollection counterDataCollection = new CounterCreationDataCollection(); // Box1
// Add the counter. Box 1
CounterCreationData averageCount64 = new CounterCreationData();
averageCount64.CounterType = PerformanceCounterType.AverageCount64;
averageCount64.CounterName = "AverageCounter64Sample";
counterDataCollection.Add(averageCount64);
// Add the base counter.
CounterCreationData averageCount64Base = new CounterCreationData();
averageCount64Base.CounterType = PerformanceCounterType.AverageBase;
averageCount64Base.CounterName = "AverageCounter64SampleBase";
counterDataCollection.Add(averageCount64Base); // Box 2
// Create the category. Box 3
PerformanceCounterCategory.Create("AverageCounter64SampleCategory",
"Demonstrates usage of the AverageCounter64 performance counter type.",
PerformanceCounterCategoryType.SingleInstance, counterDataCollection);