I am getting the same error.
Cannot find the object "Appointment_Data" because it does not exist or you do not have permissions.
I am connected under \SQLEXPRESS with Windows Authentication and no login or password.
I bought both books: Rad Controls a step by step learning guide and Part II ActiveSkill Guide.
I'm really looking forward to learning the controls so I hope a telerik person could guide me in the right direction I'd really appreciate it.