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Microsoft PRO: Design & Develop Wndws Apps Using MS .NET Framework 4 Sample Questions:

1. 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:
---
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) 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.
B) Iterate over the image files. For each image file, use the Process.Start() method to launch a console application that processes the image file.
C) Use the Parallel.ForEach() method to process the images concurrently.
D) Use the ThreadPool.QueueUserWorkItem() method to queue up a single work item that uses the Parallel.ForEach () method to process the image files concurrently.

2. You are designing an application by using Windows Presentation Foundation (WPF) and Microsoft .NET Framework 4.
The application will run on Windows 7-based kiosks that are located indoors and outdoors. The kiosk displays have a photo sensor that will update the application with the current ambient luminosity.
You need to ensure that the user interface (UI) of the application dynamically changes the application theme based on the ambient luminosity.
What should you use?

A) A visual state manager to add VisualStateGroup objects
B) A VisualBrush control to paint the UI
C) An attached behavior to change a merged resource dictionary
D) A RenderTransform control applied to the root canvas

3. 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) 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.
B) Create a global WIN 32 unhandled exception filter.
Record relevant application-specific information to an external log from within the filter.
C) 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.
D) Subscribe to the unhandled exception event handler for the AppDomain object.
Record relevant application-specific information to an external log.

4. You are designing an update to an existing Windows Presentation Foundation (WPF) application. You plan to use Microsoft Visual Studio 2010. The updated WPF application will require a specific version of a third-party component.
You have the following requirements:
- Deploy the update by using Windows Installer. - Update the WPF application only if the required version of the third-party component is present on the client computer.
You need to recommend configuration settings for the application installer.
Which property should you recommend be set?

A) The Version property of the .NET Launch Condition
B) TheRemovePreviousVersions property of the Setup Project
C) The Version property of the Setup Project
D) The Condition property of a new Launch Condition

5. You are designing an application by using Windows Presentation Foundation (WPF) and
Microsoft .NET Framework 4.
The user interface (UI) tier of the application will be implemented in WPF.
The middle tier of the application is implemented by using an existing COM component.
The middle tier contains a long-running method named ProcessDatA.
You need to ensure that users can continue to use the UI while ProcessData is running.
What should you do?

A) Use an asynchronous worker thread to call ProcessDatA.
B) Call the Run method of the Dispatcher class before invoking ProcessDat
C) Use the Invoke method of the Dispatcher class to call ProcessDatA.
D) Call the DoEvents method of the Application class before invoking ProcessDatA.

Solutions: