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

1. You are designing a Windows Forms application that allows users to search a product catalog and place orders.
You have the following requirements:
- Display a progress indicator while the application is searching the catalog. - Ensure that users can cancel search operations.
You need to recommend an approach that meets the requirements.
What should you recommend?

A) Implement the search as a Windows Communication Foundation (WCF) service by using the AsyncPattern property of the OperationContractattribute.
B) Execute the search on the user interface thread. Provide a Cancel button to cancel the search.
C) Implement the search as a duplex service.
D) Use a BackgroundWorker component to perform the search.

2. You are designing a Windows Presentation Foundation (WPF) application that will be used to display real-time data from a Microsoft SQL Server 2008 database.
You need to recommend an approach for displaying the datA.
Which two actions should you recommend? (Each correct answer presents part of the solution. Choose two.)

A) Use a System.Runtime.Caching object in the data layer with a sliding expiration, and query the database when the Cache object expires.
B) Use a SqlCacheDependency object in the data layer to query the database when a change is detected.
C) Implement OneWayToSource binding between the controls in the WPF application and objects in the data layer.
D) Implement OneWay binding between the controls in the WPF application and objects in the data layer.

3. You are designing a Windows Presentation Foundation (WPF) client application from which
employees will access a Web service.
Business partners will access the Web service by using proprietary client applications.
You need to recommend a solution for ensuring the integrity of data in the system.
What should you recommend?

A) Implement data validation on the client and reject invalid datA.
B) Secure the Web service by using SSL.
C) Implement data validation at the service layer and reject invalid datA.
D) Encrypt data while storing it in the database.

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

5. You are designing a Windows Presentation Foundation (WPF) client application that requests reports from a Windows Communication Foundation (WCF) Web service.
Users must be able to perform other tasks while the WCF Web service generates the report.
You need to recommend a message exchange pattern for the communication between the WPF application and the WCF Web service.
What are two possible message exchange patterns that will meet the requirements? (Each correct answer presents a complete solution. Choose two.)

A) Datagram with session
B) Request-Response
C) Duplex
D) Datagram without session

Solutions: