asp.net上传execl文件后,在页面上加载显示(示例代码)

代码如下:
    #region 上传Execl文件
    protected void Button1_Click(object sender, EventArgs e)
    {
        if (FileUpload1.HasFile)
        {
            string NewFileName = string.Empty;
            string ErrorMess = UpLoadFile(FileUpload1, ".xls|.xlsx", 1024 * 5, Server.MapPath("/Report/SocialApply/"), 1, out NewFileName);
            if (string.IsNullOrEmpty(ErrorMess))
            {
                Label1.Text = "√文件上传成功";
                ViewState["UpLoadFile"] = "/Report/SocialApply/" + NewFileName;
                try
                {
                    FileStream file = new FileStream
                        (Server.MapPath(ViewState["UpLoadFile"] as string),
                        FileMode.Open, FileAccess.Read,
                        FileShare.ReadWrite);
                    DataTable dt1 = FairHR.Util.XmlExcelReport.ReadExcelToDataTable(file, 0, 0);

                    ViewState.Add("ViewDT", dt1);
                    GridView1.DataSource = ViewState["ViewDT"] as DataTable;
                    GridView1.DataBind();
                    file.Close();
                    //Maticsoft.Common.MessageBox.ResponseScript(Page, "$.messager.alert('系统提示', '操作成功！', 'info');");
                }
                catch