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

1. 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) 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.
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) 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.

2. You are debugging a Windows application that uses Windows Presentation Foundation (WPF) and Microsoft Visual Studio 2010.
The application is deployed as an XAML browser application (XBAP). Some users report that they are not able to use the drag-and-drop functionality.
You need to ensure that all users can use the drag-and-drop functionality.
What should you do?

A) Register the assembly that contains the IDataObject objects to the GAC on all client computers.
B) Require the FullTrust permission on the XBAP application.
C) Use loose XAML.
D) Add the URL for the application to the browser's trusted sites list.

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.
The mainframe-based database will be replaced in one year.
You have the following requirements:
---
Centrally manage all database connections.
Minimize changes to the code base when the database is replaced.
Ensure that the WPF application will not need to be redeployed when the database
is replaced.
You need to recommend an approach for designing the data access layer.
What should you recommend?

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) 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.
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) 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.

4. You are modifying an existing Windows Presentation Foundation (WPF) application that uses .NET Framework 4. The WPF application uses a wizard to capture data and insert the data into a database. The database includes one parent table and many child tables.
Inserting captured data in the database locks many database tables and delays application access.
You have the following requirements:
Reduce delays when saving datA.
Ensure that other application users are not blocked from reading datA.
Ensure that captured data is available only after all child tables are updated.
You need to recommend an approach for inserting captured data into the database.
---
What should you recommend?

A) Insert captured data by using a single transaction as the user completes each wizard page.
B) Insert all captured data in a single transaction when the user completes the wizard.
C) Insert captured data by using non-transactional operations when the user completes the wizard.
D) Insert captured data by using optimistic concurrency as the user completes each wizard page.

5. You are upgrading a stand-alone Windows Presentation Foundation (WPF) application and an XAML browser application (XBAP) to Microsoft .NET Framework 4.
You plan to add .NET 4 types and members to both applications.
Both applications consume a common utility assembly that modifies files on a local file system. The utility assembly requires full trust.
You need to ensure that both applications can use the common utility assembly without any security-related exceptions.
What should you do?

A) Change the <supportedRuntime> element for the WPF application to the .NET Framework 3.5.
B) Change the <supportedRuntime> element for the XBAP application to the .NET Framework 3.5.
C) Apply the AllowPartiallyTrustedCallersAttribute attribute to the utility assembly.
D) Apply the AllowPartiallyTrustedCallersAttribute attribute to the XBAP application.

Solutions: