I go to the Properties of LinqDataSource1, and manually type in CategoriesClassesDataContext in the ContextTypeName field. Then I click that Smart Tag of LinqDataSource1, Configure Data Source. On the screen of Choose a Context Object, I checked the checkbox for Show only DataContext objects. Now, CategoriesClassesDataContext is being displayed in that listbox under Choose your context object:
When I click the Next button,
Microsoft Visual Studio error says:
The type ''CategoriesClassesDataContext'' could not be loaded. If the type is located in the App_Code folder, please check that it compiles. If the type is located in a compiled assembly, please check that the assembly is referenced by the project.