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

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

2. You are designing a Windows Presentation Foundation (WPF) data entry application. The application uses data binding to bind controls in the user interface (UI) to business objects. The UI uses validation rules for each input control.
The data validation rules change based on the state of the business object.
You need to recommend a validation strategy that will allow changes to the validation rules without changes to the UI code.
What should you recommend?

A) Set the ValidationStep attribute on ValidationRule elements to RawProposedValue.
B) Implement the IDataErrorInfo interface in the business objects and replace all
ValidationRule elements with Data ErrorValidat ion Rule elements.
C) Set the ValidationStep attribute on ValidationRule elements to CommittedValue.
D) Implement the IDataErrorInfo interface in the business objects and replace all ValidationRule elements with Exception ValidationRule elements.

3. You are updating a Windows desktop client application that was created by using Microsoft .NET Framework 4 and Microsoft Visual Studio 2010.
The application displays data derived from several database queries. The display takes a long time to update.
The application currently uses a BackgroundWorker thread and a Parallel.ForEach statement on that thread.
Users have requested a modification to the program that would allow them to interrupt the display of data and begin processing a new and different query.
You decide to provide a new Stop button on the user interface (UI) to allow the user to terminate the current data display and initiate the new query. The main UI thread must be notified when the current data processing is terminated so that the new query can be started.
You need to implement the Stop button event handler.
What should you do?

A) Use the DoWork handler of the worker thread and test a shared status value.
Use a break statement to terminate the Parallel.ForEach loop.
B) Use a CancelAsync() function to cancel the worker thread.
In the Parallel.ForEach loop, test the CancellationPending property.
If the property is set to true, perform the following tasks:
Write a loopStatus.Stop() statement.
Set the DoWorkEventArgs.Cancel property to true.
Use a return statement to exit from the loop.
C) Use the DoWork handler of the worker thread and test a shared status value.
Use a loopStatus.Stop() statement to terminate the Parallel.ForEach loop.
D) Use the DoWork handler of the worker thread and test a shared status value.
Use the Thread.Abort() statement to terminate the worker thread. Start a new BackgroundWorker thread from the main UI thread.

4. You are designing a Windows application by using Microsoft .NET Framework 4 and Microsoft Visual Studio 2010.
You plan to implement control caching to improve the loading time of a control. It is not required to refresh the content of the control after the application loads. The application will be compiled by using the .NET 4 client profile.
You need to ensure that the following requirements are met:
--
The control is reusable in multiple forms.
Data in the control is cached when the application is loaded.
What should you do?

A) In the constructor of the application window, add code to load the control. Save the control to a static variable.
B) In the constructor of the application window, add code to load the control. Save the control to the cache by using objects in the System.WeB.Caching namespace.
C) In the Load event of the application window, add code to load the control. Save the control to an instance variable.
D) In the Load event of the application window, add code to load the control. Save the control to the cache by using objects in the System.WeB.Caching namespace.

5. You are designing a Windows Presentation Foundation (WPF) application that connects to a data access layer on a server.
You have the following requirements for all security-related exceptions:
- Exceptions that occur in the data access layer must be handled in a single exception handler in the WPF application. - Exceptions must pass customized messages back to the WPF application.
You need to recommend an approach for creating new exception classes in the data access layer.
From which class should you inherit?

A) System.Security.SecurityException
B) System.ApplicationException
C) System.AccessViolationException
D) System.InvalidOperationException

Solutions: