protected void grvNhomChucDanh_DeleteCommand(object sender, GridCommandEventArgs e)
        {
            switch (e.Item.OwnerTableView.Name)
            {
            case "tbl_NhomChucDanh":
                var iDNhomChucDanh = (e.Item as GridDataItem).GetDataKeyValue("IDNhomChucDanh").ToString();
                int id             = Convert.ToInt32(iDNhomChucDanh);
                _entities.DeleteChucDanhChuyenMonByIDNhomChucDanh(id);
                _entities.SaveChanges();
                break;

            case "tbl_ChucDanhChuyenMon":
                var      iDChucDanhChuyenMon = (e.Item as GridDataItem).GetDataKeyValue("IDChucDanh").ToString();
                int      idcm     = Convert.ToInt32(iDChucDanhChuyenMon);
                ChucDanh chucdanh = _entities.ChucDanhs.Where(d => d.IDChucDanh == idcm).First();
                _entities.ChucDanhs.DeleteObject(chucdanh);
                _entities.SaveChanges();
                break;
            }
        }