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; }