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

1. You are evaluating an existing Windows Presentation Foundation (WPF) application. The WPF application runs in a Web browser as a XAML browser application (XBAP). The WPF application runs in the Intranet zone with Full Trust. A client certificate for the WPF application has been generated.
Users are unable to access the WPF application. You locate the following message in the security log: "User has refused to grant required permissions to the application." Users state that they are clicking OK in all message boxes that appear.
You need to recommend an approach for ensuring that the WPF application runs correctly on all client computers.
Which two actions should you recommend? (Each correct answer presents part of the solution. Choose two.)

A) Sign the ClickOnce manifest for the WPF application.
B) Use the Code Access Security Policy Tool to grant the appropriate permissions.
C) Modify the ClickOnce manifest for the WPF application to grant the appropriate permissions.
D) Import the client certificate to the Trusted Root store.

2. You are upgrading a stand-alone Windows Presentation Foundation (WPF) application and an XAML browser application (XBAP) to Microsoft .NET Framework 4.
You plan to add .NET 4 types and members to both applications.
Both applications consume a common utility assembly that modifies files on a local file system. The utility assembly requires full trust.
You need to ensure that both applications can use the common utility assembly without any security-related exceptions.
What should you do?

A) Apply the AllowPartiallyTrustedCallersAttribute attribute to the utility assembly.
B) Apply the AllowPartiallyTrustedCallersAttribute attribute to the XBAP application.
C) Change the <supportedRuntime> element for the XBAP application to the .NET Framework 3.5.
D) Change the <supportedRuntime> element for the WPF application to the .NET Framework 3.5.

3. 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.

4. 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 users1 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 HTTPS traffiC.
You need to recommend an approach for minimizing the attack surface of the WCF Web service.
What should you recommend?

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

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) Use the Parallel.ForEach() method to process the images concurrently.
B) 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.
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. For each image file, use the Process.Start() method to launch a console application that processes the image file.

Solutions: