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

1. You are designing a sales and inventory tracking system by using Microsoft Visual Studio 2010 and Microsoft SQL Server 2008.
The sales, inventory, and shipping tables will reside in different databases on different database servers.
You need to ensure that the tables are updated simultaneously.
What should you do?

A) Use Distributed transactions.
B) Use the ADO.NET Entity Framework.
C) Use Microsoft Sync Framework.
D) Use LINQ to SQL.

2. You are designing a Windows Presentation Foundation (WPF) application by using Microsoft .NET Framework 4 and Microsoft Visual Studio 2010.
The application will consist of a user interface (UI) tier and a middle tier. The middle tier will be implemented by using Windows Communication Foundation (WCF).
Each method in the middle tier will contain the following catch block.
Catch(ArgumentNullExceptione)
{
throw e;
}
When testing the application, you discover that all ArgumentNullExceptions exceptions that occur in the middle tier do not contain accurate stack trace information.
You need to design the exception handling strategy for the application.
What should you do?

A) Use a DispatcherUnhandledExceptionEvent handler in the UI tier.
B) Remove the exception parameter from the ArgumentNullException handler.
C) Create an ArgumentNullException handler in the UI tier.
D) Use a DispatcherUnhandledExceptionEvent handler in the middle tier.

3. You design a Windows Presentation Foundation (WPF) application that interacts with a Windows Communication Foundation (WCF) Web service. The WCF Web service throws exceptions of type Exception.
The WPF application crashes when the WCF Web service throws an exception.
You need to recommend an error-handling strategy that allows users to submit updated data to the WCF Web service without restarting the WPF application.
What should you recommend?

A) Modify the Web service to throw custom exceptions derived from the ApplicationException class.
B) Modify the Web service to throw exceptions of type FaultException.
C) Modify the Web service to throw exceptions of type InvalidOperationException.
D) Modify the Web service to throw custom exceptions derived from the Exception class.

4. You are designing a .NET Framework 4 solution that includes a Windows Presentation Foundation (WPF) application, a Windows service, and a private assembly shared by the WPF application and by the Windows service.
The solution stores data in a local Microsoft SQL Server Compact 3.5 database. The WPF application and Windows service will each access the database directly. The solution will be installed by using Windows Installer.
You have the following requirements:
- The installer must allow users to specify the installation folders for the WPF application and for the database. - The solution must support the deployment of updates to the WPF application without restarting the Windows service.
You need to recommend an approach for installing the solution.
Which two actions should you recommend? (Each correct answer presents part of the solution. Choose two.)

A) Install the Windows service to a different folder from the WPF application.
B) In the installer, set an environment variable that defines the database installation path.
C) In the installer, create a registry key that stores the WPF application installation path.
D) Install the Windows service to the same folder as the WPF application.

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

Solutions: