private void detach_tbl_saches(tbl_sach entity)
		{
			this.SendPropertyChanging();
			entity.tbl_linhvuc = null;
		}
 partial void Deletetbl_sach(tbl_sach instance);
 partial void Inserttbl_sach(tbl_sach instance);
 partial void Updatetbl_sach(tbl_sach instance);
		private void attach_tbl_saches(tbl_sach entity)
		{
			this.SendPropertyChanging();
			entity.tbl_tacgia = this;
		}