Custom membership provider: Define an ADO.NET entity data model for the customer table
To have a strongly-typed model for accessing the data, you can add an Entity Model to your project in Visual Studio in the following way:
    - Create a folder, named Model, under the root of your project.
 
    - Open the context menu of the folder and click Add » New Item...
 
    - In the left pane, under Visual C#, click Data.
 
    - In the center pane, click ADO.NET Entity Data Model.
 
    - In Name input field, enter MembershipModel.edmx and click Add.
    The Entity Data Model Wizard window appears. 
    - Select the EF Designer from database model and click Next.
 
    - Connect to the database you created.
 
    -   Add the Customers table from the database to the model and click Finish.
 
The data model is created and a CustomMembershipProviderEntities class is created, which is used later on in the sample code.