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

1. You are designing a Windows application by using Microsoft .NET Framework 4 and Microsoft Visual Studio 2010.
You plan to implement control caching to improve the loading time of a control. It is not required to refresh the content of the control after the application loads.
The application will be compiled by using the .NET 4 client profile.
You need to ensure that the following requirements are met:
--
The control is reusable in multiple forms.
Data in the control is cached when the application is loaded.
What should you do?

A) In the Load event of the application window, add code to load the control. Save the control to an instance variable.
B) In the Load event of the application window, add code to load the control. Save the control to the cache by using objects in the System.WeB.Caching namespace.
C) In the constructor of the application window, add code to load the control. Save the control to a static variable.
D) In the constructor of the application window, add code to load the control. Save the control to the cache by using objects in the System.WeCaching namespace.

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

3. 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 a database factory class from within the WPF application.
B) 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.
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 data access layer class.
D) 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.

4. You are designing an n-tier Windows solution that includes a data entry application. The solution uses Microsoft .NET Framework 4 and Microsoft SQL Server 2008.
The data entry application sends customer orders to a middle-tier server. The middle-tier server sends orders to a set of services that perform operations on the orders. Business rules determine which services to call and whether to run them in sequence or in parallel. The business rules are complex and data dependent.
The Windows solution must meet the following requirements:
- Optimize application performance by using dynamic load balancing. - Allow for business rules to be changed at runtime.
You need to recommend an approach that meets the requirements.
What should you recommend?

A) A routed service that uses Windows Communication Foundation (WCF) messaging
B) A Windows Communication Foundation (WCF) service for each operation, with a controller class on the middle-tier server
C) SQL Server stored procedures
D) Private message queues with a controller class on the middle-tier server

5. ---
You are reviewing an existing Windows application that uses .NET Framework 4.
When the user clicks a button, the application sequentially processes thousands of image files contained in a directory.
The user interface becomes unresponsive while the application processes the files.
You have the following requirements:
Modify the button's click event.
Increase application throughput by processing multiple image files concurrently.
Ensure that the user interface remains responsive while the application processes
the image files.
You need to recommend an approach for meeting the requirements.
What should you recommend?

A) Iterate over the image files. For each image file, use the Process.Start() method to launch a console application that processes the image file.
B) Use the ThreadPool.QueueUserWorkItem() method to queue up a single work item that uses the Parallel.ForEach () method to process the image files concurrently.
C) Use the Parallel.ForEach() method to process the images concurrently.
D) Iterate over the image files by using the Parallel.ForEach()method. For each image file, start a separate thread that processes the image file, by using the Thread.Start() method.

Solutions: