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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.
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 the user interface thread.
C) Use synchronous method calls from a thread other than the thread on which the user interface runs.
D) Use asynchronous method calls from the user interface thread.

2. You are designing an n-tier Windows solution that includes a data entry application. The solution uses Microsoft .NET Framework 4 and Microsoft SQL Server 2008.
The data entry application sends customer orders to a middle-tier server. The middle-tier server sends orders to a set of services that perform operations on the orders. Business rules determine which services to call and whether to run them in sequence or in parallel. The business rules are complex and data dependent.
The Windows solution must meet the following requirements:
- Optimize application performance by using dynamic load balancing.
- Allow for business rules to be changed at runtime.
You need to recommend an approach that meets the requirements.
What should you recommend?

A) Private message queues with a controller class on the middle-tier server
B) SQL Server stored procedures
C) A Windows Communication Foundation (WCF) service for each operation, with a controller class on the middle-tier server
D) A routed service that uses Windows Communication Foundation (WCF) messaging

3. You are designing an application by using Microsoft .NET Framework 4 and Microsoft Visual Studio 2010.
The application is used mostly in a disconnected scenario. The application requires offline data from a Microsoft SQL Server 2008 database. When the application connects to the network, data will be modified and synchronized.
You need to ensure that the application does not access the database server directly to synchronize data when online.
Which technology should you use?

A) ADO.NET Sync Services
B) WCF Data Service
C) Remote Data Access
D) SQL Server Merge Replication

4. You are designing a .NET Framework 4 solution that includes a Windows Presentation Foundation (WPF) application. The WPF application connects to a Microsoft SQL Server 2008 database. You plan to deploy the WPF application to millions of client computers. The SQL Server database will be hosted in a data center.
The WPF application will query the database to provide type-ahead assistance as users enterdata.The WPF application will send a query after each character is entered. Each query will access multiple joined tables.
You need to recommend an approach for maximizing scalability of the solution.
What should you recommend?

A) Denormalize the data to fewer tables.
B) Create stored procedures to abstract the tables.
C) Use System.Runtime.Caching to cache query results on the client.
D) Create a separate data layer with caching.

5. 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 loopStatus.Stop() statement to terminate the Parallel.ForEach loop.
B) 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.
C) 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.
D) Use the DoWork handler of the worker thread and test a shared status value.
Use a break statement to terminate the Parallel.ForEach loop.

Solutions: