partial void DeleteDONHANG(DONHANG instance);
partial void UpdateDONHANG(DONHANG instance);
private void detach_DONHANGs(DONHANG entity) { this.SendPropertyChanging(); entity.KHACHHANG = null; }
partial void InsertDONHANG(DONHANG instance);
private void attach_DONHANGs(DONHANG entity) { this.SendPropertyChanging(); entity.KHACHHANG = this; }