showModalDialog的刷新问题

<asp:Button ID="btnVerify" runat="server" CssClass="btn2" OnClientClick="return verifyDetail();"  Text="确认选择" 

OnClick="btnVerify_Click"  />

<script>
  function verifyDetail()//invoked by "确认选择"
          {   
            if(varNumber==0)
            {
                alert("请选择核销条目！");
                return false;
            }       
            var varCurClass=document.form1.ddlVerifyCurClass[document.form1.ddlVerifyCurClass.selectedIndex].value;//币种

            var varHidAmount=document.getElementById("hidAmount").value;//隐藏域中的金额

//            var varSZDW=document.getElementById("hidSZDW").value;//涉帐单位,准备不传这个参数了！①.已改用根据发票id 把

inv_main.company_id和pd_company.id两个字段关联，从pd_company中取COMP_C_CNAME字段
//            &szdw="+escape(varSZDW)+"//②.传参数时用escape()函数，接受页面（invoice_verify_confirm.aspx）用string wd = 

Server.UrlDecode(Request.QueryString["szdw"]);则wd为正常汉字

            var varID=document.getElementById("hidInvoiceId").value;//隐藏域中的已选中项的ID
            
            var varCompID=document.getElementById("hidSZDWID").value;//隐藏域中的已选中项的对应公司的ID


//            var   s   =   new   Object();   
//            s.name   ="aaa";   
            
            var win=window.showModalDialog("invoice_verify_confirm.aspx?

CurClass="+varCurClass+"&HidAmount="+varHidAmount+"&id="+varID+"&compID="+varCompID+"","","status:Modeless;edge:raised;unador

ned:no;scroll=yes;resizable:yes;center=yes;help:no;dialog890px;dialogheight:425px");          
            if(win=="ref")
            {              
                // self.location.reload();//如何触发 OnClick="btnSearch_Click"
                  //alert("aa");
//                 document.all("btnSearch").click(); 

//                document.getElementById("btnSearch").onclick=function()
//                {
//                     alert('a');
//                }
                //form1.submit();                 
                
                return true;
                               
                
            }  
            else
            {
                return false;
//有这句就不会刷新父窗口，因为不会再执行服务器代码,showModalDialog窗口以右上角“关闭”，以“取消”按钮关闭，都不刷新
            }   
//            if(win.type=="")//传递回的type为空的时候才刷新页面。   
//              {   
//                      alert("刷新");   
//                      location.reload();   
//              }          
//             return ;
//            alert("aa");
         


           
  
  
  
  
          }



</script>

protected void btnVerify_Click(object sender, EventArgs e)
{//该函数“顺便”回去服务器把页面上的其他控件“重新”取了回来，实现了“整个”页面的“刷新”
      BindData();
}

 private void BindData()//从inv_main表中选出已开票记录
    {
        Grid1.Levels[0].Columns.Clear();//在 Grid1.DataBind();执行结束，所有列已Bind over 不能再执行本句，否则会清除所有已经bind 的列

        string strSql = @"
SELECT  
dbo.INV_MAIN.ID,

cast(0 as bit) as choice,

dbo.INV_MAIN.INV_NO,
dbo.PD_COMPANY.COMP_C_CNAME, 

dbo.INV_MAIN.CURRENCY, 
dbo.INV_MAIN.AMOUNT,

cast(dbo.INV_MAIN.AMOUNT_HX as decimal(18,2)) as AMOUNT_HX , 
dbo.INV_MAIN.AMOUNT_WHX,

'海运出口' as ywlx,

dbo.JOB_SE.JOBNO, 
dbo.PD_USER.USER_NAME,


convert(varchar(10),DATE_JOB,120) as DATE_JOB,
dbo.JOB_SE.WTBH,

dbo.PD_COMPANY.ID as compID 

FROM         dbo.FEE_IN LEFT OUTER JOIN
                      dbo.PD_USER RIGHT OUTER JOIN
                      dbo.JOB_SE ON dbo.PD_USER.USER_CODE = dbo.JOB_SE.CR_CODE ON dbo.FEE_IN.PARENTID = dbo.JOB_SE.ID RIGHT OUTER JOIN
                      dbo.PD_COMPANY RIGHT OUTER JOIN
                      dbo.INV_MAIN ON dbo.PD_COMPANY.ID = dbo.INV_MAIN.COMPANY_ID ON dbo.FEE_IN.INVOICE_ID = dbo.INV_MAIN.ID where (1=1)";
        //dbo.JOB_SE.ETD,需不需要这个字段？dbo.INV_MAIN.DATE_JOB（业务日期）对应job_se中ＥＴＤ

        if (ViewState["strSqlBindData"] == null)
        {
            ViewState["strSqlBindData"] = strSql;
        }

        SqlDataAdapter sda = new SqlDataAdapter(strSql, conn);
        conn.Open();
        DataSet ds = new DataSet();
        sda.Fill(ds, "INV_MAIN");
        Grid1.DataSource = ds;
        Grid1.DataBind();


        Grid1.Levels[0].Columns["ID"].Visible = false;

        Grid1.Levels[0].Columns["choice"].HeadingText = "选择";
        Grid1.Levels[0].Columns["choice"].ColumnType = GridColumnType.CheckBox;
        Grid1.Levels[0].Columns["choice"].Align = ComponentArt.Web.UI.TextAlign.Center;
        Grid1.Levels[0].Columns["choice"].Width = 26;

        Grid1.Levels[0].Columns["INV_NO"].HeadingText = "帐单号";     
        Grid1.Levels[0].Columns["INV_NO"].Align = ComponentArt.Web.UI.TextAlign.Center;
        Grid1.Levels[0].Columns["INV_NO"].Width = 45;

        Grid1.Levels[0].Columns["COMP_C_CNAME"].HeadingText = "涉帐单位";
        Grid1.Levels[0].Columns["COMP_C_CNAME"].Align = ComponentArt.Web.UI.TextAlign.Center;
        Grid1.Levels[0].Columns["COMP_C_CNAME"].Width = 56;

        Grid1.Levels[0].Columns["CURRENCY"].HeadingText = "币种";
        Grid1.Levels[0].Columns["CURRENCY"].Align = ComponentArt.Web.UI.TextAlign.Center;
        Grid1.Levels[0].Columns["CURRENCY"].Width = 26;

        Grid1.Levels[0].Columns["AMOUNT"].HeadingText = "帐单金额";
        Grid1.Levels[0].Columns["AMOUNT"].Align = ComponentArt.Web.UI.TextAlign.Right;
        Grid1.Levels[0].Columns["AMOUNT"].Width =56;
        Grid1.Levels[0].Columns["AMOUNT"].FormatString = "N2";

        Grid1.Levels[0].Columns["AMOUNT_HX"].HeadingText = "已核销";      
        Grid1.Levels[0].Columns["AMOUNT_HX"].Align = ComponentArt.Web.UI.TextAlign.Right;
        Grid1.Levels[0].Columns["AMOUNT_HX"].Width = 45;//
        Grid1.Levels[0].Columns["AMOUNT_HX"].FormatString = "N2";

        Grid1.Levels[0].Columns["AMOUNT_WHX"].HeadingText = "未核销";
        Grid1.Levels[0].Columns["AMOUNT_WHX"].Align = ComponentArt.Web.UI.TextAlign.Right;
        Grid1.Levels[0].Columns["AMOUNT_WHX"].Width = 45;
        Grid1.Levels[0].Columns["AMOUNT_WHX"].FormatString = "N2";//两位小数，每三位有逗号

        Grid1.Levels[0].Columns["ywlx"].HeadingText = "业务类型";
        Grid1.Levels[0].Columns["ywlx"].Align = ComponentArt.Web.UI.TextAlign.Center;
        Grid1.Levels[0].Columns["ywlx"].Width = 56;

        Grid1.Levels[0].Columns["JOBNO"].HeadingText = "工作编号";
        Grid1.Levels[0].Columns["JOBNO"].Align = ComponentArt.Web.UI.TextAlign.Center;
        Grid1.Levels[0].Columns["JOBNO"].Width = 56;

        Grid1.Levels[0].Columns["USER_NAME"].HeadingText = "操作人";
        Grid1.Levels[0].Columns["USER_NAME"].Align = ComponentArt.Web.UI.TextAlign.Center;
        Grid1.Levels[0].Columns["USER_NAME"].Width = 36;

       

        Grid1.Levels[0].Columns["DATE_JOB"].HeadingText = "抵离港日";//?dateJOb 还是ＥＴＤ？dbo.INV_MAIN.DATE_JOB（业务日期）对应job_se中ＥＴＤ
        Grid1.Levels[0].Columns["DATE_JOB"].Align = ComponentArt.Web.UI.TextAlign.Center;
        Grid1.Levels[0].Columns["DATE_JOB"].Width = 56;


        Grid1.Levels[0].Columns["WTBH"].HeadingText = "委托编号";
        Grid1.Levels[0].Columns["WTBH"].Align = ComponentArt.Web.UI.TextAlign.Center;
        Grid1.Levels[0].Columns["WTBH"].Width = 56;

        Grid1.Levels[0].Columns["compID"].HeadingText = "涉帐ＩＤ";
        Grid1.Levels[0].Columns["compID"].Align = ComponentArt.Web.UI.TextAlign.Center;
        Grid1.Levels[0].Columns["compID"].Visible = false;
        Grid1.Levels[0].Columns["compID"].Width = 56;

    }