public void BindLocation()
    {
        int rowcount = 1;

        string sortbycoloumn = (ViewState["SORTBYCOLOUMN"] == null) ? null : (ViewState["SORTBYCOLOUMN"].ToString());
        int?   sortdirection = null; if (ViewState["SORTDIRECTION"] != null)
        {
            sortdirection = Int32.Parse(ViewState["SORTDIRECTION"].ToString());
        }



        DataTable dt = BLL_PURC_ItemLocation.GetLocation_Search(UDFLib.ConvertIntegerToNull(ddlPLocation.SelectedValue), txtSearchBy.Text, sortbycoloumn, sortdirection, ucCustomPagerItems.CurrentPageIndex, ucCustomPagerItems.PageSize, ref rowcount);

        gvLocation.DataSource = dt;
        gvLocation.DataBind();

        ucCustomPagerItems.CountTotalRec = rowcount.ToString();
        ucCustomPagerItems.BuildPager();
    }
    protected void btnExport_Click(object sender, ImageClickEventArgs e)
    {
        int rowcount = ucCustomPagerItems.isCountRecord;

        string sortbycoloumn = (ViewState["SORTBYCOLOUMN"] == null) ? null : (ViewState["SORTBYCOLOUMN"].ToString());
        int?   sortdirection = null; if (ViewState["SORTDIRECTION"] != null)
        {
            sortdirection = Int32.Parse(ViewState["SORTDIRECTION"].ToString());
        }



        DataTable dt = BLL_PURC_ItemLocation.GetLocation_Search(UDFLib.ConvertIntegerToNull(ddlPLocation.SelectedValue), txtSearchBy.Text, sortbycoloumn, sortdirection, null, null, ref rowcount);



        string[] HeaderCaptions  = { "Parent Name", "Location Name" };
        string[] DataColumnsName = { "Parent_Name", "Location_Name" };

        GridViewExportUtil.ShowExcel(dt, HeaderCaptions, DataColumnsName, "Item Location", "Item Location");
    }