//Reservation Update(Reservation modified, Reservation original) public Reservation Update(Reservation modified, Reservation original) { using (var context = new AutoReservationEntities()) { try { context.Reservationen.Attach(original); context.Entry(original).CurrentValues.SetValues(modified); return modified; } catch (DbUpdateConcurrencyException e) { HandleDbConcurrencyException<Reservation>(context, original); return null; } } }