private void BindGrid()
        {
            CheckOutRequestBusiness business = new CheckOutRequestBusiness();
            var dt = business.GetListOFRequestByNextStatusForFaregh((int)(CheckOutStatusEnum.CheckOutAllStatusEnum.end));

            grd_Students.DataSource = dt;
            grd_Students.DataBind();
            GridFilterMenu menu = grd_Students.FilterMenu;

            filterMenu(menu);
        }
        protected void grd_Students_NeedDataSource(object sender, GridNeedDataSourceEventArgs e)
        {
            //dt = business.GetListOFRequestByNextStatus((int)CheckOutStatusEnum.FareghReqStatus.fareghotahsilan_ok + 1);
            dt = business.GetListOFRequestByNextStatusForFaregh((int)(CheckOutStatusEnum.FareghReqStatus.end));
            //grd_Students.DataSource = dt;
            //grd_Students.DataBind();
            grd_Students.Visible = true;
            //var ds = dt.Clone();
            //foreach (DataRow row in dt.Rows)
            //{
            //    if (Convert.ToInt64(row["RequestTypeID"]) == 15)
            //        ds.Rows.Add(row.ItemArray);
            //}
            grd_Students.DataSource = dt;


            GridFilterMenu menu = grd_Students.FilterMenu;

            filterMenu(menu);
        }