Why does ASP.NET MVC 4 SimpleMembershipProvider keep creating aspnetdb.mdf?

When you create a new ASP.NET MVC 4 Internet Web Application it creates a nice template with authentication enabled with new SimpleMembershipProvider It contains InitializeSimpleMembershipAttribute class which creates built-in Entity Framework Code First database and initializes Simple Membership: using (var context = new UsersContext()) { if (!context.Database.Exists()) { // Create the…