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Programming in C#

Question No: 111 – (Topic 2)

You are creating an application that reads from a database.

You need to use different databases during the development phase and the testing phase by using conditional compilation techniques.

What should you do?

  1. Configure the Define TRACE constant setting in Microsoft Visual Studio.

  2. Specify the /define compiler option.

  3. Run the Assembly Linker tool from the Windows Software Development Kit (Windows SDK).

  4. Decorate the code by using the [assembly:AssemblyDelaySignAttribute(true)] attribute.

Answer: B

Explanation: You can specify the compiler settings for your application in several ways:

  • The property pages

  • The command line

  • #CONST (for Visual Basic) and #define (for C#)

  • Note: You can have either the Trace or Debug conditional attribute turned on for a build, or both, or neither. Thus, there are four types of build: Debug, Trace, both, or neither. Some release builds for production deployment might contain neither; most debugging builds contain both.

    Reference: How to: Compile Conditionally with Trace and Debug https://msdn.microsoft.com/en-us/library/64yxa344(v=vs.110).aspx

    Question No: 112 DRAG DROP – (Topic 2)

    You have an application that accesses a Microsoft SQL Server database.

    The database contains a stored procedure named Proc1. Proc1 accesses several rows of data across multiple tables.

    You need to ensure that after Proc1 executes, the database is left in a consistent state. While Proc1 executes, no other operation can modify data already read or changed by Proc1. (Develop the solution by selecting and ordering the required code snippets.

    You may not need all of the code snippets.)

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    Answer:

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    Explanation:

    Box 1:

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    Box 2:

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    Box 3:

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    Box 4: transaction.Commit();

    Box 5:

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    Box 6: transaction.Rollback(); Box 7: } finally {

    Box 8:

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    Note:

    • Box 1: Start with the sqlconnection

    • Box 2: Open the SQL transaction (RepeatableRead)

    / IsolationLevel

    Specifies the isolation level of a transaction.

    / RepeatableRead

    Volatile data can be read but not modified during the transaction. New data can be added during the transaction.

    / ReadCommitted

    Volatile data cannot be read during the transaction, but can be modified.

    / ReadUncommitted

    Volatile data can be read and modified during the transaction. Box 3: Try the query

    Box 4: commit the transaction

    Box 5: Catch the exception (a failed transaction) Box 6: Rollback the transaction

    Box 7: Final cleanup

    Box 8: Clean up (close command and connection).

    Question No: 113 – (Topic 2)

    You are developing an application that uses several objects. The application includes the following code segment. (Line numbers are included for reference only.)

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    You need to evaluate whether an object is null. Which code segment should you insert at line 03?

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    1. Option A

    2. Option B

    3. Option C

    4. Option D

    Answer: B

    Explanation: Use the == operator to compare values and in this case also use the null literal.

    Question No: 114 – (Topic 2)

    You are creating a console application named App1. App1 will validate user input for order entries.

    You are developing the following code segment (line numbers are included for reference only):

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    You need to complete the code segment.

    The solution must ensure that prices are positive and have two decimal places. Which code should you insert at line 03?

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    1. Option A

    2. Option B

    3. Option C

    4. Option D

    Answer: B

    Explanation: * Regex.IsMatch Method (String, String)

    Indicates whether the specified regular expression finds a match in the specified input string.

    Syntax:

    public static bool IsMatch( string input,

    string pattern

    )

    Question No: 115 – (Topic 2)

    You are developing a C# application. The application includes the following code segment, (Line numbers are included for reference only.)

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    The application fails at line 17 with the following error message: quot;An item with the same key has already been added.quot;

    You need to resolve the error.

    Which code segment should you insert at line 16?

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    1. Option A

    2. Option B

    3. Option C

    4. Option D

    Answer: A

    Question No: 116 – (Topic 2)

    You are implementing a new method named ProcessData. The ProcessData() method calls a third-party component that performs a long-running operation to retrieve stock information from a web service.

    The third-party component uses the IAsyncResult pattern to signal completion of the long- running operation so that the UI can be updated with the new values.

    You need to ensure that the calling code handles the long-running operation as a System.Threading.Tasks.Task object to avoid blocking the UI thread.

    Which two actions should you perform? (Each correct answer presents part of the solution. Choose two.)

    1. Create a TaskCompletionSourcelt;Tgt; object.

    2. Call the component by using the TaskFactory.FromAsync() method.

    3. Apply the following attribute to the ProcessData() method signature: [Methodlmpl(MethodlmplOptions.Synchronized)]

    4. Apply the async modifier to the ProcessData() method signature.

    Answer: A,B

    Explanation: A: In many scenarios, it is useful to enable a Tasklt;TResultgt; to represent an external asynchronous operation. TaskCompletionSourcelt;TResultgt; is provided for this purpose. It enables the creation of a task that can be handed out to consumers, and those consumers can use the members of the task as they would any other. However, unlike most tasks, the state of a task created by a TaskCompletionSource is controlled explicitly by the methods on TaskCompletionSource. This enables the completion of the external asynchronous operation to be propagated to the underlying Task. The separation also ensures that consumers are not able to transition the state without access to the corresponding TaskCompletionSource.

    B: TaskFactory.FromAsync Method

    Creates a Task that represents a pair of begin and end methods that conform to the Asynchronous Programming Model pattern. Overloaded.

    Example:

    TaskFactory.FromAsync Method (IAsyncResult, Actionlt;IAsyncResultgt;)

    Creates a Task that executes an end method action when a specified IAsyncResult completes.

    Note:

    * System.Threading.Tasks.Task Represents an asynchronous operation.

    Question No: 117 – (Topic 2)

    You have the following code (line numbers are included for reference only):

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    You need to ensure that if an exception occurs, the exception will be logged. Which code should you insert at line 28?

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    1. Option A

    2. Option B

    3. Option C

    4. Option D

    Answer: C

    Explanation: * XmlWriterTraceListener

    Directs tracing or debugging output as XML-encoded data to a TextWriter or to a Stream, such as a FileStream.

    * TraceListener.TraceEvent Method (TraceEventCache, String, TraceEventType, Int32) Writes trace and event information to the listener specific output.

    Syntax: [ComVisibleAttribute(false)] public virtual void TraceEvent( TraceEventCache eventCache, string source,

    TraceEventType eventType, int id

    )

    Question No: 118 DRAG DROP – (Topic 2)

    You are developing a C# console application that outputs information to the screen. The following code segments implement the two classes responsible for making calls to the Console object:

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    When the application is run, the console output must be the following text: Log started

    Base: Log continuing Finished

    You need to ensure that the application outputs the correct text.

    Which four lines of code should you use in sequence? (To answer, move the appropriate classes from the list of classes to the answer area and arrange them in the correct order.)

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    Answer:

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    Explanation:

    Box 1:

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    Box 2:

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    Box 3:

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    Box 4:

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    Note:

    • The abstract keyword enables you to create classes and class members that are incomplete and must be implemented in a derived class.

    • An abstract class cannot be instantiated. The purpose of an abstract class is to provide a common definition of a base class that multiple derived classes can share.

    Question No: 119 HOTSPOT – (Topic 2)

    You define a class by using the following code:

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    You write the following code for a method (line numbers are included for reference only):

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    To answer, complete each statement according to the information presented in the code.

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    Answer:

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    Question No: 120 – (Topic 2)

    You are implementing a new method named ProcessData. The ProcessData() method calls a third-party component that performs a long-running operation.

    The third-party component uses the IAsyncResult pattern to signal completion of the long- running operation.

    You need to ensure that the calling code handles the long-running operation as a System.Threading.Tasks.Task object.

    Which two actions should you perform? (Each correct answer presents part of the solution. Choose two.)

    1. Call the component by using the TaskFactory.FromAsync() method.

    2. Create a TaskCompletionSourcelt;Tgt; object.

    3. Apply the async modifier to the method signature.

    4. Apply the following attribute to the method signature: [MethodImpl(MethodImplOptions.Synchronized)]

    Answer: A,B

    Explanation: A: TaskFactory.FromAsync Method

    Creates a Task that represents a pair of begin and end methods that conform to the

    Asynchronous Programming Model pattern. Overloaded. Example:

    TaskFactory.FromAsync Method (IAsyncResult, Actionlt;IAsyncResultgt;)

    Creates a Task that executes an end method action when a specified IAsyncResult completes.

    B: In many scenarios, it is useful to enable a Tasklt;TResultgt; to represent an external asynchronous operation. TaskCompletionSourcelt;TResultgt; is provided for this purpose. It enables the creation of a task that can be handed out to consumers, and those consumers can use the members of the task as they would any other. However, unlike most tasks, the state of a task created by a TaskCompletionSource is controlled explicitly by the methods on TaskCompletionSource. This enables the completion of the external asynchronous operation to be propagated to the underlying Task. The separation also ensures that consumers are not able to transition the state without access to the corresponding TaskCompletionSource.

    Note:

    • System.Threading.Tasks.Task Represents an asynchronous operation.

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