private void detach_DienTichSans(DienTichSan entity)
		{
			this.SendPropertyChanging();
			entity.VanPhong = null;
		}
 partial void UpdateDienTichSan(DienTichSan instance);
 partial void DeleteDienTichSan(DienTichSan instance);
 partial void InsertDienTichSan(DienTichSan instance);