Entity Framework 4.1 brought us Code First and the DbContext. The DbContext has built in data layer validation features. In this course, you’ll learn the basics of those features, then move on to learning how to customize the validation behavior. In the final module you’ll see how to integrate this data layer validation with ASP.NET MVC (which provides client and server side validation) and WCF Data Services (which needs to be tweaked in order to expose validation errors.)