asp.net上传控件在ipad中不起作用

Question

The asp.net upload control is uploading the file for first time in Ipad but not after that and not even showing any error

The code is as below

protected void UploadThisFile(FileUpload upload)
    {
        try
        {

            string folderpath = ConfigurationManager.AppSettings["BTCommDynamic"].ToString() + ConfigurationManager.AppSettings["Attachments"].ToString();
            Guid fileguid = Guid.NewGuid();
            string filename = fileguid + upload.FileName;
            if (upload.HasFile && dtFiles != null)
            {

                DataRow drFileRow = dtFiles.NewRow();
                drFileRow["FileName"] = upload.FileName;
                string theFileName = Path.Combine(Server.MapPath(folderpath), filename);
                string theFileName1 = Path.Combine(folderpath, filename);
                //string theFileName = folderpath;
                //to save the file in specified path
                upload.SaveAs(theFileName);
                drFileRow["FilePath"] = theFileName1;
                double Filesize = (upload.FileContent.Length);
                if (Filesize > 1024)
                {
                    drFileRow["FileSize"] = (upload.FileContent.Length / 1024).ToString() + " KB";
                }
                else
                {
                    drFileRow["FileSize"] = (upload.FileContent.Length).ToString() + " Bytes";
                }
                dtFiles.Rows.Add(drFileRow);
                gvAttachment.DataSource = dtFiles;
                gvAttachment.DataBind();
            }
        }
        catch (Exception ex)
        {
            string message = Utility.GetExceptionMessage(ex.GetType().ToString(), ex.Message);
            Display_Message(message);
        }

    }

Answer 1

Do you use firebug? There might be an error on a client side that prevents the work of your functionality. Do you have any logic on your client side? Some kinda jquery/ajax calls?