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

1. 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 break statement to terminate the Parallel.ForEach loop.
B) 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.
C) 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.
D) 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.

2. 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 INotifyPropertyChanged interface in the data class of the application.
C) 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.
D) Implement the IDataErrorlnfo interface in the data class of the application.

3. You are designing a Windows Forms application that allows users to search a product catalog and place orders.
You have the following requirements:
- Display a progress indicator while the application is searching the catalog. - Ensure that users can cancel search operations.
You need to recommend an approach that meets the requirements.
What should you recommend?

A) Implement the search as a Windows Communication Foundation (WCF) service by using the AsyncPattern property of the OperationContractattribute.
B) Execute the search on the user interface thread. Provide a Cancel button to cancel the search.
C) Use a BackgroundWorker component to perform the search.
D) Implement the search as a duplex service.

4. You are designing a Windows application by using Microsoft .NET Framework 4 and Microsoft Visual Studio 2010.
You need to use a replacement culture for the application at runtime.
You also need to ensure that the information in the custom culture will be available to the application.
Which two tasks should you perform? (Each correct answer presents part of the solution. Choose two.)

A) Register the replacement culture by using the CultureAndRegionInfoBuilder class.
B) Restart the process that is displaying the user interface.
C) Register the replacement culture by using the CultureInfo class.
D) Call the Save method of the CultureAndRegionInfoBuilder class instance.

5. You are designing an application by using Windows Presentation Foundation (WPF) and Microsoft .NET Framework 4.
The application retrieves customer data from an enterprise resource planning (ERP) system.
You need to ensure that the following requirements are met: - Customer data is retrieved only once.
- Customer data is available on multiple forms within the application.
- Forms can implement Two-Way binding to the customer datA.
What should you do?

A) Store the results of the query in a static DataTable object that is used by all the forms.
B) Store the results of the query in a local XML file. Bind all forms to an XMLDataAdapter object that references the local XML file.
C) Design a static class for the data that implements the INotifyPropertyChanged interface. Raise the PropertyChanged event to notify the forms when data is changed.
D) Design a static class for the data that implements the IObservable interface. Subscribe to the static class from each of the forms that use the datA.

Solutions: