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

1. You are analyzing an application that uses Microsoft .NET Framework 4 and Microsoft SQL Server 2008.
The application is used to maintain an inventory database and is accessed from several remote Windows client applications. The application frequently updates multiple rows in a database table by using a DbDataAdapter object.
Users report that the application runs slowly during peak business hours.
When large number of records are changed by multiple users, you discover the following:
The CPU utilization of the client applications is normal.
The network utilization increases slightly.
The CPU utilization of the database server remains close to the normal average
for a day.
You need to resolve the performance issue.
What should you do?

A) Move the update method calls to a separate BackgroundWorker thread.
B) Remove any limit on batch update sizes. Modify the client application to perform a single update.
C) Insert a random time interval between updates.
D) Disable batch updates. Modify the client application to perform a single update.

2. 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) Import the client certificate to the Trusted Root store.
C) Modify the ClickOnce manifest for the WPF application to grant the appropriate permissions.
D) Sign the ClickOnce manifest for the WPF application.

3. 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).
You plan to design the exception handling strategy for the application. Each method in the middle tier will contain the following catch block. Catch e AsArgumentNullException.
Throw e
When testing the application, you discover that all ArgumentNullExceptions that occur in
the middle tier do not contain accurate stack trace information.
What should you do?

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

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

5. You are developing a Windows application by using Microsoft .NET Framework 4 and Microsoft Visual Studio 2010.
The application will consume a Windows Communication Foundation (WCF) service. The WCF service will provide data to the application.
You plan to use the ADO.NET Entity Framework to create a data model that will be used by the application.
Another development team makes changes to the WCF service data contract.
You need to ensure that changes made to the WCF service data contract do not require the application to be recompiled.
What should you do?

A) Create a conceptual model based on the business model. Use a class generated from the conceptual model for programming. Update the mapping file when the new version of the WCF service is available.
B) Create a storage model based on the schema of the existing WCF service. Update the mapping file when the new version of the WCF service is available.
C) Create a storage model based on the business model. Use a class generated from the storage model for programming.
D) Create a conceptual model and a storage model based on the existing version of the WCF service.

Solutions: