partial void DeletePhuongXa(PhuongXa instance);
 partial void InsertPhuongXa(PhuongXa instance);
 partial void UpdatePhuongXa(PhuongXa instance);
		private void detach_PhuongXas(PhuongXa entity)
		{
			this.SendPropertyChanging();
			entity.QuanHuyen = null;
		}