private bool CheckTonTai(int intLuongCoSo)
 {
     bool kq = false;
     clsDM_LuongCoSo obj = new clsDM_LuongCoSo();
     kq = obj.CheckTonTai(intLuongCoSo);
     return kq;
 }
 private void LoadGridView()
 {
     clsDM_LuongCoSo obj = new clsDM_LuongCoSo();
     TableDanhMucLuongCoSo = obj.GetAll();
     grdDM_LuongCoSo.DataSource = TableDanhMucLuongCoSo;
 }