title: View Model Binding/AutoMapper
body: <p>I am using Entity Framework 4 with the Service/Repository/EF4/POCO classes technique, and I have a question about View Model binding.</p>
  
  <p>When you map a class to a view model and only take the fields the view needs, then map it back to a new instance of the class to persist to the database, how do you prevent the fields not used in the view from getting overwritten?</p>