You are designing an application by using Microsoft .NET Framework 4 and Microsoft Visual Studio 2010.
You plan to design an instrumentation strategy for the application.
You need to ensure that the strategy meets the following requirements:
- Captures detailed performance information. - Enables or disables diagnostic messages by using an application configuration option without requiring the application to restart.
What should you design?

• A. A custom performance counter
• B. An override to the Debug class
• C. A custom trace listener
• D. An override to the EventLog class

You are designing an application by using Microsoft .NET Framework 4, Microsoft Visual Studio 2010, and Microsoft SQL Server 2008.
The application will be used by a sales team to enter sales orders and update customer information.
You need to ensure that the application meets the following requirements:
- Allows users to enter sales orders while their computers are disconnected from the
network
- Uploads sales orders to the server database when connected to the network
- Compiles against the .NET Framework 4 client profile
What should you use?

• A. WCF services
• B. Microsoft Sync Framework
• C. XML files
• D. TheSystem.Web.Caching namespace classes

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:
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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. 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.
• 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. 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.
• 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.

You are designing an application by using Windows Presentation Foundation (WPF) and Microsoft .NET Framework 4.
You create a control named HelpViewer to view the Help documentation of the application. The HelpViewer control must be available to all windows in the application.
You need to ensure that the application allows users to perform the following tasks:
- Bookmark their location in the documentation and return to the bookmark from any
window.
- Hide the HelpViewer control.
- Dock the HelpViewer control.
You create a main window as a base class.
What should you do next?

• A. Add the HelpViewer control and a Frame control to a DockPanel control to the window at runtime.
  Create all other windows in the application as pages and host them in the Frame control.
• B. Add the HelpViewer control to a DockPanel control at runtime.
  Inherit all other window classes in the application from the main window base class.
• C. Add the HelpViewer control to the window at runtime.
  Inherit all other window classes in the application from the main window base class.
• D. Add the HelpViewer control and a Frame control to a StackPanel control to the window at runtime.
  Create all other windows in the application as pages and host them in the Frame control.