partial void DeleteSeat(Seat instance);
 partial void UpdateSeat(Seat instance);
		private void detach_Seats(Seat entity)
		{
			this.SendPropertyChanging();
			entity.Entertainment = null;
		}
 partial void InsertSeat(Seat instance);
		private void attach_Seats(Seat entity)
		{
			this.SendPropertyChanging();
			entity.Entertainment = this;
		}