protected void Page_Load(object sender, EventArgs e)
    {
        try
        {
            if (Session["sys_PageCount"] != null)
            {
                pageSize       = Convert.ToInt32(Session["sys_PageCount"].ToString());
                pager.PageSize = pageSize;
            }
            if (Session["pager_ShowPageIndex"] != null)
            {
                pager.ShowPageIndex = Convert.ToBoolean(Session["pager_ShowPageIndex"].ToString());
            }

            if (!IsPostBack)
            {
                totalCount        = userDal.GetRowCount(filter);
                pager.RecordCount = totalCount;
                GridDataBind();
            }
            else
            {
                pageCount     = Convert.ToInt32(ViewState["pageCount"]);
                pageIndex     = Convert.ToInt32(ViewState["pageIndex"]);
                totalCount    = Convert.ToInt32(ViewState["totalCount"]);
                filter        = ViewState["filter"].ToString();
                OrderByFields = ViewState["OrderByFields"].ToString();

                totalCount = userDal.GetRowCount(filter);
                GridDataBind();
            }
        }
        catch (Exception exp)
        {
            JScript.Instance.ShowMessage(this.UpdatePanel1, exp.Message);
        }
    }