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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.
You have the following requirements:
- Run client-side validation tests on a large result set from a Microsoft SQL Server 2008 database. - Validate each row of data without storing the entire result set in memory.
You need to recommend a data access technology.
What should you recommend?

A) ADO.NET using SqIDataReader objects
B) LINQ to SQL using the ElementAt() method
C) ADO.NET using SqIDataAdapter objects and DataSet objects
D) LINQ to Entities using the ElementAt() method

2. ---
You are designing a .NET Framework 4 solution. The solution contains a Windows Presentation Foundation (WPF) application and a Windows Communication Foundation (WCF) Web service.
The WPF application uses the WCF Web service to store data in a Microsoft SQL Server 2008 database.
You have the following requirements:
Ensure that the WPF application functions while users' computers are offline.
Minimize the time spent sending data to the WCF Web service.
Minimize disk space requirements for data storage.
You need to recommend an approach for synchronizing data between the WPF application and the database.
Which two actions should you recommend? (Each correct answer presents part of the solution. Choose two.)

A) Store data in DataSet objects. Serialize data locally by using XML serialization.
B) Create a local caching solution that periodically checks for Internet connectivity and writes directly to the local data store and to the WCF Web service.
C) Store data in custom business objects. Serialize data locally by using custom serialization.
D) Create a local caching solution that periodically checks for Internet connectivity, uses local memory, and batches changes to the WCF Web service.

3. ---
You are analyzing a Windows client application that uses Microsoft Visual Studio 2010 and Microsoft SQL Server 2008.
The application updates two database tables from the main user interface (UI) thread.
You need to ensure that the following requirements are met:
The database tables are either updated simultaneously or not updated at all.
Users are notified of the success or failure of the updates.
Users are able to perform other tasks during the update process.
What should you do?

A) Use TransactionScope in a Using block on the UI thread.
Batch the database updates by setting the DbDataAdapter.UpdateBatchSize property to 2.
B) Use TransactionScope in a Using block on the main thread.
Create a BackgroundWorker thread within the block.
Move the database updates to the BackgroundWorkerDoWork method.
C) Use TransactionScope in a Using block on the UI thread.
Create a DependentTransaction object within the block and pass the object to the BackgroundWorkerReportProgress method.
Use the object in the ReportProgress method to create a new TransactionScope block.
D) Move the database update logic to a BackgroundWorker thread.
Ensure that the thread is enclosed in a TransactionScope Using block in the BackgroundWorkerDoWork method.

4. You are designing a Windows application by using Microsoft .NET Framework 4 and Microsoft Visual Studio 2010.
The business logic layer of the application is implemented by using Windows Communication Foundation (WCF).
You create a duplex bidirectional WCF service that contains a single operation. The service operation sends the result back to the client application by using a two-way callback operation.
You plan to design a service interaction strategy.
You need to ensure that deadlocks are prevented.
What should you do?

A) Configure the CallbackBehaviorAttribute attribute to use the Synchronization context in the callback class.
B) Configure the ServiceBehaviorAttribute attribute to use the Synchronization context in the service class.
C) Configure the CallbackBehaviorAttribute attribute to use the Reentrant or Multiple
concurrency mode in the callback class.
D) Configure the ServiceBehaviorAttribute attribute to use the Reentrant or Multiple concurrency mode in the service class.

5. You are designing an application by using Windows Presentation Foundation (WPF) and
Microsoft .NET Framework 4.
The user interface (UI) tier of the application will be implemented in WPF.
The middle tier of the application is implemented by using an existing COM component.
The middle tier contains a long-running method named ProcessDatA.
You need to ensure that users can continue to use the UI while ProcessData is running.
What should you do?

A) Use the Invoke method of the Dispatcher class to call ProcessDatA.
B) Call the Run method of the Dispatcher class before invoking ProcessDatA.
C) Use an asynchronous worker thread to call ProcessDatA.
D) Call the DoEvents method of the Application class before invoking ProcessDat

Solutions: