private void detach_tbl_HoaDons(tbl_HoaDon entity)
 {
     this.SendPropertyChanging();
     entity.tbl_KhachHang = null;
 }
 partial void Updatetbl_HoaDon(tbl_HoaDon instance);
 partial void Deletetbl_HoaDon(tbl_HoaDon instance);
 partial void Inserttbl_HoaDon(tbl_HoaDon instance);