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

Question 1

You are designing a Windows Presentation Foundation (WPF) data entry application. The application uses data binding to bind controls in the user interface (UI) to business objects. The UI uses validation rules for each input control.
The data validation rules change based on the state of the business object.
You need to recommend a validation strategy that will allow changes to the validation rules without changes to the UI code.
What should you recommend?

A. Implement the IDataErrorInfo interface in the business objects and replace all ValidationRule elements with Exception ValidationRule elements.
B. Set the ValidationStep attribute on ValidationRule elements to CommittedValue.
C. Set the ValidationStep attribute on ValidationRule elements to RawProposedValue.
D. Implement the IDataErrorInfo interface in the business objects and replace all
ValidationRule elements with Data ErrorValidat ion Rule elements.

Question 2

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

Question 3

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.

Question 4

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.InvalidOperationException
C. System.AccessViolationException
D. System.Security.SecurityException

Question 5

You are designing a new feature for an existing Windows Forms application by using Microsoft .NET Framework 4.
The application contains multiple forms that are loaded into a parent Multiple Document Interface (MDI) form. Your company policy does not allow the use of third-party controls.
You need to ensure that the new feature meets the following requirements: - It provides a three-dimensional scale model.
- It allows users to change the colors of the model and communicates the color
selections back to the application. - It allows the model to scale, based on the user's client computer display resolution. - It is a child form in the MDI application.
What should you do?

A. Design the new feature in a new application by using Windows Presentation Foundation (WPF).
Invoke the new WPF application from the existing Windows Forms application.
B. Design the new feature by using a Windows Presentation Foundation (WPF) user control.
Use the ElementHost class to host the WPF user control in the existing Windows Forms application.
C. Design the new feature in a new Windows Presentation Foundation (WPF) application.
Host the existing application inside the new WPF application by using the WindowsFormsHost class
D. Design the new feature in the existing Windows Forms application as a Windows form.
Add the form as a child form to the MDI window.

Solutions: