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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 that connects to a data access layer on a server.
You have the following requirements for all security-related exceptions:
- Exceptions that occur in the data access layer must be handled in a single exception handler in the WPF application. - Exceptions must pass customized messages back to the WPF application.
You need to recommend an approach for creating new exception classes in the data access layer.
From which class should you inherit?

A) System.ApplicationException
B) System.AccessViolattonException
C) System.InvalidOperationException
D) System.Security.SecurityException

2. You are designing an n-tier solution that includes a Windows Presentation Foundation (WPF) client application. The WPF application connects to a middle-tier server that runs the data access layer.
The data access layer connects to a Microsoft SQL Server 2008 database and to a mainframe-based database.

A) Add the connection string information for the databases to the configuration file for the WPF application. Implement one class in the WPF application for each data source.
B) Add the connection string information for the databases to the configuration file for the WPF application. Implement a database factory class from within the WPF application.
C) Create a data access layer class that uses a database factory class to access all databases. Add the connection string information for the databases to the configuration file for the WPF application.
D) Create a data access layer class that uses a database factory class to access all databases. Add the connection string information for the databases to the configuration file for the data access layer class.

3. You are designing a Windows Presentation Foundation (WPF) application. The application data files have the file name extension.abc.
The WPF application installer must meet the following requirements:
----
Add a shortcut to the desktop.
Install infrequently used assemblies on demand.
Associate the .abc file name extension with the WPF application.
Roll back the installation in the event of a failure.
You need to recommend a deployment method.
What should you recommend?

A) XCopy
B) ClickOnce
C) Background Intelligent Transfer Service (BITS)
D) Windows Installer

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

5. You are designing an application by using Windows Presentation Foundation (WPF), Microsoft .NET Framework 4, and Microsoft SQL Server 2008.
The application will contain several forms that include custom data validators.
You need to ensure that data is validated before the database updates occur. You also need to ensure that the validation logic can be reused.
How should you design the validation?

A) Subscribe to the TextChanged event for all user interface (UI) components of the application.
Perform data validation in the event handler and alert users when a data entry error occurs.
B) Implement the IDataErrorlnfo interface in the data class of the application.
C) Implement the INotifyPropertyChanged interface in the data class of the application.
D) Subscribe to the MouseLeave event for all user interface (UI) components of the application.
Perform data validation in the event handler and alert users when a data entry error occurs.

Solutions: