private void detach_Hotels(Hotel entity)
		{
			this.SendPropertyChanging();
			entity.City = null;
		}
		private void attach_Hotels(Hotel entity)
		{
			this.SendPropertyChanging();
			entity.City = this;
		}
 partial void UpdateHotel(Hotel instance);
 partial void DeleteHotel(Hotel instance);
 partial void InsertHotel(Hotel instance);