protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            Common.FillMonthList(ddlMonth);
            Common.FillYearList(5, ddlYear);
            //Common.EmptyTextBoxValues(this);
            lblMsg.Text = "";
            this.EntryMode(false);
            //Common.FillDropDownList(objMstMgr.SelectSalaryHeadCategoryWise("V"), ddlSalHead, "HEADNAME", "SHEADID", true, "Select");
            ddlMonth.SelectedValue = Convert.ToString(DateTime.Today.Month);
            ddlYear.SelectedValue  = Convert.ToString(DateTime.Today.Year);
            Common.FillDropDownList_Nil(objMstMgr.SelectClinic(), ddlClinic);
        }
        ScriptManager _ScriptMan = ScriptManager.GetCurrent(this);

        _ScriptMan.AsyncPostBackTimeout = 1200;
        _ScriptMan.RegisterPostBackControl(this.btnExport);
    }