.net 如何不被讯雷拦截下载的文件？

        public void down(string url)
        {
            System.IO.FileInfo DownloadFile = new FileInfo(url);
            Response.Clear();
            Response.ContentType = "application/octet-stream";
            Response.AppendHeader("Content-Disposition", "attachment;filename=" + HttpUtility.UrlEncode(DownloadFile.Name, System.Text.Encoding.UTF8));
            Response.AppendHeader("Content-Length", DownloadFile.Length.ToString());
            Response.ContentEncoding = System.Text.Encoding.GetEncoding("gb2312");
            Response.WriteFile(DownloadFile.FullName);
            Response.Flush();
            Response.Clear();
            Response.Close();
            HttpContext.Current.ApplicationInstance.CompleteRequest();


        } --------------------编程问答-------------------- 上面这代码中，如果我安装了讯雷的话，会被拦截了地址，直接跳出来一个网页的地址，请问怎么解决 --------------------编程问答-------------------- 把讯雷的监视插件清理掉，
或是把下载写成流的方式， --------------------编程问答-------------------- //流方式下载
    protected void Button4_Click(object sender, EventArgs e)
    {
        string fileName = "aaa.txt";//客户端保存的文件名
        string filePath = Server.MapPath("DownLoad/aaa.txt");//路径
        //以字符流的形式下载文件
        FileStream fs = new FileStream(filePath, FileMode.Open);
        byte[] bytes = new byte[(int)fs.Length];
        fs.Read(bytes, 0, bytes.Length);
        fs.Close();
        Response.ContentType = "application/octet-stream";
        //通知浏览器下载文件而不是打开
        Response.AddHeader("Content-Disposition", "attachment; filename=" + HttpUtility.UrlEncode(fileName, System.Text.Encoding.UTF8));
        Response.BinaryWrite(bytes);
        Response.Flush();
        Response.End();
    }

这样写同样会被拦截了地址，还有什么改进的方法吗？ --------------------编程问答-------------------- 点击下载按钮，跳转到一个随便的页面，里边写下载的代码。代码最后然后吧那个页面关了。

补充：.NET技术 ,  C#