asp.net做下载时下载下来的总是aspx页面
现在项目中用到这个功能，弄了一天也没弄好，我的代码如下：
            string Txt = friendBll.outFriend(userid, groupid);//获取文件内容
            fileName = groupBll.getFile(groupid).ToString();//文件名称
            fileName += DateTime.Now.ToShortDateString();

            string strFileName = HttpUtility.UrlEncode(fileName) + ".txt"; //文件名
            Response.Clear();
            Response.BufferOutput = false;
            Response.ContentEncoding = System.Text.Encoding.GetEncoding("UTF-8");
            Response.ContentType = "text/html";
            Response.AddHeader("Content-Disposition", string.Format("attachment;FileName= {0}",strFileName));
            byte[] bytes = Encoding.GetEncoding("UTF-8").GetBytes(Txt);
            Response.BinaryWrite(bytes); //文件流
            Response.Flush();
            Response.Close();
            Response.End();
------解决方案--------------------
asp.net上传下载大全