partial void DeleteDuong(Duong instance);
partial void UpdateDuong(Duong instance);
private void detach_Duongs(Duong entity)
{
this.SendPropertyChanging();
entity.QuanHuyen = null;
}
partial void InsertDuong(Duong instance);
private void attach_Duongs(Duong entity)
{
this.SendPropertyChanging();
entity.QuanHuyen = this;
}