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

1. You are designing a .NET Framework 4 solution that contains a Windows Presentation Foundation (WPF) application and a Windows Communication Framework (WCF) Web service.
The WPF application will be deployed to users1 desktops located in the company's corporate network. The WCF Web service will be deployed to a Web farm located in the company's perimeter network. The firewall between the perimeter network and the Internet allows only HTTP and HTTPS traffiC.
You need to recommend an approach for minimizing the attack surface of the WCF Web service.
What should you recommend?

A) Set up an SSL certificate on the server.
B) Configure a WCF endpoint to use the basicHttpBinding binding.
C) Add a load-balancing router to the Web farm configuration.
D) Configure a WCF endpoint to use the NetTcpBinding binding.

2. You are modifying an existing Windows Presentation Foundation (WPF) application that uses .NET Framework 4. The WPF application uses a wizard to capture data and insert the data into a database. The database includes one parent table and many child tables.
Inserting captured data in the database locks many database tables and delays application access.
You have the following requirements:
Reduce delays when saving datA.
Ensure that other application users are not blocked from reading datA.
Ensure that captured data is available only after all child tables are updated.
You need to recommend an approach for inserting captured data into the database.
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What should you recommend?

A) Insert captured data by using a single transaction as the user completes each wizard page.
B) Insert all captured data in a single transaction when the user completes the wizard.
C) Insert captured data by using optimistic concurrency as the user completes each wizard page.
D) Insert captured data by using non-transactional operations when the user completes the wizard.

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 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.
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 the DoWork handler of the worker thread and test a shared status value.
Use a break statement to terminate the Parallel.ForEach loop.
D) 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.

4. 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 business model. Use a class generated from the storage model for programming.
C) 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.
D) Create a conceptual model and a storage model based on the existing version of the WCF service.

5. You are designing a Windows Presentation Foundation (WPF) application for your company by using Microsoft .NET Framework 4 and Microsoft Visual Studio 2010.
The business layer of the application is implemented by using Windows Communication Foundation (WCF).
You plan to support non-repudiation and data integrity for WCF messages.
You need to design the security strategy for the application.
What should you do?

A) Attach a digital signature to the WCF messages.
B) Encrypt the WCF messages by using the Internet Protocol Security (IPSec) protocol.
C) Encrypt the WCF messages by using the Secure Sockets Layer (SSL) protocol.
D) Implement message-level security by using digital certificates as client computer credentials.

Solutions: