打开上传服务器文件，如果为TXT格式时,会将页面生成的HTML代码写入到文本中

Question

代码如下：fileProcessingNotice.SaveAs(Server.MapPath("~/FileUpload/") + fileProcessingNotice.FileName);
            iput1.Value = Server.MapPath("~/FileUpload/") + fileProcessingNotice.FileName;FileInfo fi = new FileInfo(iput1.Value);
                if (fi.Exists)
                {
                    FileInfo DownloadFile = new FileInfo(iput1.Value);
                    Response.Clear();
                    Response.ClearHeaders();
                    Response.Buffer = false;
                    Response.ContentType = "application/octet-stream";
                    Response.AppendHeader("Content-Disposition", "attachment;filename=" + Server.UrlDecode(DownloadFile.Name));
                    Response.AppendHeader("Contnet-Length", DownloadFile.Length.ToString());
                    Response.WriteFile(DownloadFile.FullName);
                    Response.Flush();
                    HttpContext.Current.ApplicationInstance.CompleteRequest();