You are reviewing an existing Windows application that uses .NET Framework 4.
When the user clicks a button, the application sequentially processes thousands of image
files contained in a directory.
The user interface becomes unresponsive while the application processes the files.
You have the following requirements:
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Modify the button's click event.
Increase application throughput by processing multiple image files concurrently.
Ensure that the user interface remains responsive while the application processes
the image files.
You need to recommend an approach for meeting the requirements.
What should you recommend?

• A. Use the ThreadPool.QueueUserWorkItem() method to queue up a single work item that uses the Parallel.ForEach () method to process the image files concurrently.
• B. Use the Parallel.ForEach() method to process the images concurrently.
• C. Iterate over the image files. For each image file, use the Process.Start() method to launch a console application that processes the image file.
• D. Iterate over the image files by using the Parallel.ForEach() method. For each image file, start a separate thread that processes the image file, by using the Thread.Start()method.

You are designing a Windows application by using Microsoft .NET Framework 4.
Remote users have limited network connectivity. Users will not have write permissions to
the local file system.
You plan to design the error logging strategy for the application.
You need to ensure that the application can collect error information. You also need to ensure that the errors can be analyzed from a centralized location.
What should you do?

• A. Use the Microsoft Sync Framework.
• B. Log the errors to a Web service.
• C. Use a local log file.
• D. Log the errors to the Windows System event log.

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You are working with an existing Windows Presentation Foundation (WPF) application in Microsoft Visual Studio 2010. The WPF application requires approximately one minute to initialize before displaying its main window.
You have the following requirements:
Immediately display a splash screen when the WPF application launches.
Allow for the display of an initialization progress bar on the splash screen.
Close the splash screen when the WPF application is ready to display the main
window.
You need to recommend an approach for meeting the requirements.
What should you recommend?

• A. Create a SplashScreen object. Display the object in the code-behind of the App.xaml file.
• B. Move the initialization code to the code-behind of the main window.
• C. Launch a custom splash screen by using a Window object. When the initialization completes, launch the main window from the splash screen.
• D. Compile an image into the WPF application with a Build Action value of SplashScreen.

You are designing a Windows Presentation Foundation (WPF) application for your company by using Microsoft .NET Framework 4 and Microsoft Visual Studio 2010.
The business layer of the application is implemented by using Windows Communication Foundation (WCF).
You plan to support non-repudiation and data integrity for WCF messages.
You need to design the security strategy for the application.
What should you do?

• A. Attach a digital signature to the WCF messages.
• B. Implement message-level security by using digital certificates as client computer credentials.
• C. Encrypt the WCF messages by using the Internet Protocol Security (IPSec) protocol.
• D. Encrypt the WCF messages by using the Secure Sockets Layer (SSL) protocol.