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

1. You design a Windows Presentation Foundation (WPF) application that interacts with a Windows Communication Foundation (WCF) Web service. The WCF Web service throws exceptions of type Exception.
The WPF application crashes when the WCF Web service throws an exception.
You need to recommend an error-handling strategy that allows users to submit updated data to the WCF Web service without restarting the WPF application.
What should you recommend?

A) Modify the Web service to throw custom exceptions derived from the Exception class.
B) Modify the Web service to throw custom exceptions derived from the ApplicationException class.
C) Modify the Web service to throw exceptions of type FaultExceptton.
D) Modify the Web service to throw exceptions of type InvalidOperationException

2. You are designing a Windows Presentation Foundation (WPF) application. The main window of the WPF application includes two panels: panel1and panel2.
The WPF application must meet the following requirements:
- Panel2 must be enabled only after users have entered values into multiple text boxes in panel1. - The background color of panel2 must be set to a specific color based on oneof the text box values in panel1. - The background color of panel2 must be set at the same time the panel is enabled.
You need to recommend an approach for meeting the requirements.
What should you recommend?

A) Use a Command object.
B) Use a Data Template object.
C) Use a MultiDataTrigger object.
D) Use Dependency properties.

3. You are designing a Windows Presentation Foundation (WPF) application. The main window of the WPF application includes two panels: panel1and panel2.
The WPF application must meet the following requirements:
- Panel2 must be enabled only after users have entered values into multiple text boxes in panel1. - The background color of panel2 must be set to a specific color based on oneof the text box values in panel1. - The background color of panel2 must be set at the same time the panel is enabled.
You need to recommend an approach for meeting the requirements. What should you recommend?

A) Use a DataTemplate object.
B) Use a Command object.
C) Use a MultiDataTrigger object.
D) Use Dependency properties.

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

5. 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 users' 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 HTTPStraffic.
You need to recommend an approach for minimizing the attack surface of the WCF Web service.
What should you recommend?

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

Solutions: