partial void DeleteDONDATHANG(DONDATHANG instance);
partial void InsertDONDATHANG(DONDATHANG instance);
partial void UpdateDONDATHANG(DONDATHANG instance);
private void detach_DONDATHANGs(DONDATHANG entity)
{
this.SendPropertyChanging();
entity.KHACHHANG = null;
}