Microsoft
70-518 · Question #191
70-518 Question #191: Real Exam Question with Answer & Explanation
The correct answer is D. Create persistent-ignorant objects.. See the full explanation below for the reasoning.
Question
You are designing a Windows Presentation Foundation (WPF) application by using Microsoft .NET Framework 4, Microsoft Visual Studio 2010, and Microsoft SQL Server 2008. You have designed the application to use the ADO.NET Entity Framework for the Data Access Layer (DAL). You have designed the user interface (UI) of the application by using the Model-View-ViewModel (M-V-VM) pattern. The middle tier of the application is designed by using Windows Communication Foundation (WCF). The database schema changes often. The DAL entity objects are required to be referenced from the middle tier and the ViewModel layer of the UI. You need to ensure that the DAL entity objects are updated when the database schema changes. What should you do?
Options
- ACreate an observable collection of objects.
- BCreate persistent-aware objects.
- CCreate typed DataSets.
- DCreate persistent-ignorant objects.
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