private void detach_tblMaytinhs(tblMaytinh entity)
 {
     this.SendPropertyChanging();
     entity.tblPhonghoc = null;
 }
 partial void UpdatetblMaytinh(tblMaytinh instance);
 partial void DeletetblMaytinh(tblMaytinh instance);
 partial void InserttblMaytinh(tblMaytinh instance);