The context type MyDataContext does not belong to any registered model.

Are you getting the following error message at runtime in your ASP.NET application that is using LINQ to SQL?

The context type MyDataContext does not belong to any registered model.

If you are, it is very likely you have not registered you DataContext. To register you DataConext open your Global.asax.cs and add the following to the RegisterRoutes() method.

model.RegisterContext(typeof(MyDataContext), new ContextConfiguration() { ScaffoldAllTables = true });