private void detach_DonDatHangs(DonDatHang entity)
 {
     this.SendPropertyChanging();
     entity.TaiKhoan = null;
 }
 partial void UpdateDonDatHang(DonDatHang instance);
 partial void DeleteDonDatHang(DonDatHang instance);
 partial void InsertDonDatHang(DonDatHang instance);