private void detach_SinhViens(SinhVien entity)
 {
     this.SendPropertyChanging();
     entity.LOP = null;
 }
 private void attach_SinhViens(SinhVien entity)
 {
     this.SendPropertyChanging();
     entity.LOP = this;
 }
 partial void UpdateSinhVien(SinhVien instance);
 partial void DeleteSinhVien(SinhVien instance);
 partial void InsertSinhVien(SinhVien instance);