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

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

2. You are designing a Windows Presentation Foundation (WPF) application.
The application calls methods that perform long-running computational tasks.
You need to recommend an approach for ensuring that the application remains responsive while the tasks are executing.
What are two possible ways to achieve this goal? (Each correct answer presents a complete solution. Choose two.)

A) Run the user interface from a new multi-threaded apartment (MTA) thread.
B) Use synchronous method calls from a thread other than the thread on which the user interface runs.
C) Use synchronous method calls from the user interface thread.
D) Use asynchronous method calls from the user interface thread.

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

4. An existing Windows application uses a Windows Communication Foundation (WCF) Web service that is available only to employees.
You have the following requirements:
---
Make the WCF Web service available to business partners.
Enable business partners to send a profile token.
Ensure that the currently deployed application continues to function.
You need to recommend a solution that meets the requirements.
What should you recommend?

A) Modify the WCF Web service operations to accept the profile token as an additional parameter.
B) Implement the WCF Web service as a REST service.
C) Use SOAP headers to pass the profile token to the service operations.
D) Convert the WCF Web service to a Duplex service that implements a callback to accept the profile token.

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

Solutions: