无法读取文本框值

我在 AjaxFileUpload1 的 pageupload 事件期间将页面上的文本框的值分配给变量。问题是，即使没有错误抛出，我也没有从文本框获取值到我的变量。我的变量是

        string scn = txtSCN.Text;
        string line1 = txtLineitem.Text;
        string aging1 = txtAging.Text;  

知道为什么吗AjaxFileUpload1_UploadComplete无法读取文本框值

我的cs代码是：

    protected void AjaxFileUpload1_UploadComplete(object sender,     AjaxControlToolkit.AjaxFileUploadEventArgs e)
         {
   string c = System.IO.Path.GetFileName(e.FileName);
        string dpath = "~/Profile/Images/";
        string scn = txtSCN.Text;
        string line1 = txtLineitem.Text;
        string aging1 = txtAging.Text;             
        AjaxFileUpload1.SaveAs(MapPath(Path.Combine(dpath,c)));
        dpath = dpath + c;
        string str1 = ConfigurationManager.ConnectionStrings["ProTracConnGMCH"].ConnectionString;
        SqlConnection cn = new SqlConnection(str1);
        cn.Open();
        string sql = "Update tbNoquoteFollowupupdate set MailreceivedURL = '" + dpath + "', chkMailreceived = 1 , Buyername =  '" + buyername + "'  where scn = '" + scn + "' AND lineItem = '" + line1 + "' and Aging ='" + aging1 + "' ";
        SqlCommand cmd = new SqlCommand(sql, cn);
        int i = cmd.ExecuteNonQuery();

        if (i > 0)
        {
           // AjaxFileUpload1.SaveAs(Path.Combine(dpath, e.FileName));
            //AjaxFileUpload1.SaveAs(MapPath(dpath));
        }
        cn.Close();
        BindGridviewData1();
        cn.Open();
        string cmd2 = "Insert Into tbMulitmailsreived (scn, lineItem,followupdate, Aging,MailreceivedURL) Values ('" + scn + "', '" + line1 + "','" + DateTime.Now + "','" + aging1 + "','" + dpath + "')";
        SqlCommand sqlCommand2 = new SqlCommand(cmd2, cn);
        sqlCommand2.ExecuteNonQuery();
        cn.Close();
    }

请帮我

我上周花了一些时间调查这个question https://stackoverflow.com/questions/21752542/cant-get-text-from-textbox-in-method-for-ajaxfileupload1-uploadcomplete但最终找不到一个简单的解决方案。该问题中的OP通过在会话中存储值来解决它，但要使其工作，您仍然需要在某个阶段引起回发。

显然，AjaxFileUpload 控件计划有在 Context Keys 集合中传递值的功能，但这从未实现过实施的 http://ajaxcontroltoolkit.codeplex.com/workitem/27384. This question https://stackoverflow.com/questions/13080186/how-can-i-use-the-contextkeys-property-for-the-ajaxfileupload-control描述了如何自己实现这一点。

I think我看到了围绕同一主题的另一个问题，OP 通过更改为使用来解决它异步文件上传 http://www.asp.net/AjaxLibrary/AjaxControlToolkitSampleSite/AsyncFileUpload/AsyncFileUpload.aspx控制，但我会被纠正......