asp.Net execlファイルをアップロードした後、ページに表示をロードします(サンプルコード)

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    #region Execl
    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 = "√ ";
                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, "$.messager.alert(' ', ' !', 'info');");
                }
                catch
                {
                    Maticsoft.Common.MessageBox.ResponseScript(Page, "$.messager.alert(' ', ' Execl ', 'warning');");
                }
            }
            else
            {
                Label1.Text = "× ";
            }
        }
        else
        {
            Label1.Text = "× ";
        }
        ScriptManager.RegisterClientScriptBlock(Page, this.GetType(), "idAlert1", "closeLoad();", true);
    }
    #endregion

    #region
    ///


    ///
    ///

    ///
    /// , .jpg|.gif|.bmp
    /// , k
    /// , server.mappath
    /// 1 ,0
    ///
    public static string UpLoadFile(FileUpload fu, string type, int size, string path, int nametype, out string newFileName)
    {
        newFileName = null;
        string erorr = null;
        int Size = fu.PostedFile.ContentLength / 1024;
        if (Size > size)
        {
            erorr = " !";
            return erorr;
        }
        string Type = fu.FileName;
        if (Type.IndexOf(".") == -1) { erorr = " !"; return erorr; }
        Type = Type.Substring(Type.LastIndexOf(".")).ToUpper();
        type = type.ToUpper();
        if (type.IndexOf(Type) == -1) { erorr = " !"; return erorr; }

        string filename = "";
        if (nametype == 1)
        {
            string nowdate = DateTime.Now.ToString();
            nowdate = nowdate.Replace(":", "").Replace(" ", "").Replace("-", "").Trim();
            Random r = new Random();
            int a = r.Next(1000);
            filename = nowdate + a.ToString() + Type;
            newFileName = filename;
        }
        else
        {
            filename = fu.FileName;
            if (System.IO.File.Exists(path + filename)) { erorr = " !"; return erorr; }
        }

        fu.SaveAs(path + filename);
        return erorr;// , null
    }
    #endregion