partial void DeleteCONGNO(CONGNO instance);
 partial void UpdateCONGNO(CONGNO instance);
		private void detach_CONGNOs(CONGNO entity)
		{
			this.SendPropertyChanging();
			entity.KHACHHANG = null;
		}
 partial void InsertCONGNO(CONGNO instance);
		private void attach_CONGNOs(CONGNO entity)
		{
			this.SendPropertyChanging();
			entity.KHACHHANG = this;
		}