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:
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Reduce delays when saving datA.
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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 optimistic concurrency 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 a single transaction as the user completes each wizard page.

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You are designing a .NET Framework 4 solution. The solution contains a Windows Presentation Foundation (WPF) application and a Windows Communication Foundation (WCF) Web service.
The WPF application uses the WCF Web service to store data in a Microsoft SQL Server 2008 database.
You have the following requirements:
Ensure that the WPF application functions while users' computers are offline.
Minimize the time spent sending data to the WCF Web service.
Minimize disk space requirements for data storage.
You need to recommend an approach for synchronizing data between the WPF application and the database.
Which two actions should you recommend? (Each correct answer presents part of the solution. Choose two.)

• A. Store data in DataSet objects. Serialize data locally by using XML serialization.
• B. Store data in custom business objects. Serialize data locally by using custom serialization.
• C. Create a local caching solution that periodically checks for Internet connectivity, uses local memory, and batches changes to the WCF Web service.
• D. Create a local caching solution that periodically checks for Internet connectivity and writes directly to the local data store and to the WCF Web service.

You are designing an application by using Windows Presentation Foundation (WPF) and Microsoft .NET Framework 4.
The application will run on Windows 7-based kiosks that are located indoors and outdoors. The kiosk displays have a photo sensor that will update the application with the current ambient luminosity.
You need to ensure that the user interface (UI) of the application dynamically changes the application theme based on the ambient luminosity.
What should you use?

• A. A RenderTransform control applied to the root canvas
• B. A VisualBrush control to paint the UI
• C. An attached behavior to change a merged resource dictionary
• D. A visual state manager to add VisualStateGroup objects

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 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.
• B. Implement the INotifyPropertyChanged interface in the data class of the application.
• C. Implement the IDataErrorlnfo interface in the data class of the application.
• D. 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.