You are developing an application that includes a Windows Communication Foundation (WCF) service. The service includes a custom TraceSource object named ts and a method named DoWork. The application must meet the following requirements:
* Collect trace information when the DoWork() method executes.
* Group all traces for a single execution of the DoWork() method as an activity that can be viewed in the WCF Service Trace Viewer Tool.
You need to ensure that the application meets the requirements.
How should you complete the relevant code? (To answer, select the correct code segment from each drop-down list in the answer area.)

Correct Answer:

Explanation

Activities are logical unit of processing. You can create one activity for each major processing unit in which you want traces to be grouped together. For example, you can create one activity for each request to the service. To do so, perform the following steps.
Save the activity ID in scope.
Create a new activity ID.
Transfer from the activity in scope to the new one, set the new activity in scope and emit a start trace for that activity.
The following code demonstrates how to do this.
Guid oldID = Trace.CorrelationManager.ActivityId;
Guid traceID = Guid.NewGuid();
ts.TraceTransfer(0, "transfer", traceID);
Trace.CorrelationManager.ActivityId = traceID; // Trace is static
ts.TraceEvent(TraceEventType.Start, 0, "Add request");
Reference: Emitting User-Code Traces
https://msdn.microsoft.com/en-us/library/aa738759(v=vs.110).aspx

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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()

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You are developing a class named Scorecard. The following code implements the Scorecard class. (Line numbers are included for reference only.)

You create the following unit test method to test the Scorecard class implementation:

You need to ensure that the unit test will pass.
What should you do?

• A.Option B
• B.Option C
• C.Option A
• D.Option D

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You are developing code for an application that retrieves information about Microsoft .NET Framework assemblies.
The following code segment is part of the application (line numbers are included for reference only):

You need to insert code at line 04. The code must load the assembly. Once the assembly is loaded, the code must be able to read the assembly metadata, but the code must be denied access from executing code from the assembly.
Which code segment should you insert at line 04?

• A.Assembly.ReflectionOnlyLoadFrom(bytes);
• B.Assembly.ReflectionOniyLoad(bytes);
• C.Assembly.LoadFrom(bytes);
• D.Assembly.Load(bytes);

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You need to store the values in a collection.
The solution must meet the following requirements:
The values must be stored in the order that they were added to the collection.
The values must be accessed in a first-in, first-out order.
Which type of collection should you use?

• A.SortedList
• B.Queue
• C.ArrayList
• D.Hashtable

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