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You are designing an n-tier Windows application by using Microsoft .NET Framework 4, Microsoft Visual Studio 2010, and Microsoft SQL Server 2008.
The application will replace an existing client/server application. The existing application was created by using Microsoft Visual Basic 6.0 and consists of a series of COM components that access a SQL Server database.
You plan to move the existing COM components into a Windows Communication Foundation (WCF) tier.
You need to ensure that the COM components can be replaced without impacting the existing user interface (UI) tier.
You also need to ensure that the COM components can be replaced separately.
What should you do?

• A. Use .NET COM Interop on the client tier to interact directly with the COM components until they are replaced by the managed code.
• B. Create a common assembly on the UI tier of the new application to interface with the COM components.
• C. Convert the Visual Basic 6.0 source code to managed code by using the Visual Studio converters. Use these code components on the client/server application until they are replaced individually with the new permanent managed code functionality.
• D. Create a common assembly on the WCF tier of the new application to interface with the COM components.

You are designing a complex and critical Windows desktop application by using Microsoft .NET Framework 4 and Microsoft Visual Studio 2010.
You plan to implement a logging strategy for the application.
You need to record all unexpected errors that occur in the application.
What should you do?

• A. Create a generic catch (Exception e) block in the Main method of the application.
  Record relevant application-specific information to a log in the Main method.
• B. Create a global WIN 32 unhandled exception filter.
  Record relevant application-specific information to an external log from within the filter.
• C. Subscribe to the unhandled exception event handler for the application's dispatcher on the main application thread.
  Record relevant application-specific information to an external log.
• D. Subscribe to the unhandled exception event handler for the AppDomain object.
  Record relevant application-specific information to an external log.

You are updating a Windows desktop client application that was created by using Microsoft .NET Framework 4 and Microsoft Visual Studio 2010.
The application displays data derived from several database queries. The display takes a long time to update.
The application currently uses a BackgroundWorker thread and a Parallel.ForEach statement on that thread.
Users have requested a modification to the program that would allow them to interrupt the display of data and begin processing a new and different query.
You decide to provide a new Stop button on the user interface (UI) to allow the user to terminate the current data display and initiate the new query. The main UI thread must be notified when the current data processing is terminated so that the new query can be started.
You need to implement the Stop button event handler.
What should you do?

• A. Use the DoWork handler of the worker thread and test a shared status value.
  Use the Thread.Abort () statement to terminate the worker thread.
  Start a new BackgroundWorker thread from the main UI thread.
• B. Use a CancelAsync() function to cancel the worker thread.
  In the Parallel.ForEach loop, test the CancellationPending property.
  If the property is set to true, perform the following tasks:
  Write a loopStatus.Stop() statement.
  Set the DoWorkEventArgs.Cancel property to true.
  Use a return statement to exit from the loop.
• C. Use the DoWork handler of the worker thread and test a shared status value.
  Use a loopStatus.Stop() statement to terminate the Parallel.ForEach loop.
• D. Use the DoWork handler of the worker thread and test a shared status value.
  Use a break statement to terminate the Parallel.ForEach loop.

You are developing an application by using Microsoft .NET Framework 4.
The application will be used by all employees of your company. Local file stores on the computers are secure and inaccessible remotely.
You need to design a remote monitoring strategy to monitor the usage time of the application by each user.
What should you do?

• A. Use the System.Management.Instrumentation namespace to issue event queries against methods that pass ProgressEvent and StoppedEvent arguments. Publish the events to the Event Log.
• B. Create a TraceLog object and the Trace object by using the System.Diagnostics element to trace startup, shutdown, and user idle time events throughout the application.
• C. Use the System.Management.Instrumentation namespace to publish startup, shutdown, and user idle time events of the application. Publish the events to Microsoft Operations Manager.
• D. Create a TraceLog object by using the System.Diagnostics element in the application configuration file. Add the TraceSource element for startup, shutdown, and user idle time events.

You are designing a .NET Framework 4 solution that contains a Windows Presentation Foundation (WPF) application and a Windows Communication Framework (WCF) Web service. The WPF application will be deployed to users' desktops located in the company's corporate network. The WCF Web service will be deployed to a Web farm located in the company's perimeter network. The firewall between the perimeter network and the Internet allows only HTTP and HTTPStraffic.
You need to recommend an approach for minimizing the attack surface of the WCF Web service.
What should you recommend?

• A. Set up an SSL certificate on the server.
• B. Configure a WCF endpoint to use the NetTcpBinding binding.
• C. Configure a WCF endpoint to use the basicHttpBinding binding.
• D. Add a load-balancing router to the Web farm configuration.