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     public void downloadfile(string s_fileName)
     {
         HttpContext.Current.Response.ContentType = "application/ms-download";
         string s_path = HttpContext.Current.Server.MapPath("~/") + s_fileName;
         System.IO.FileInfo file = new System.IO.FileInfo(s_path);
         HttpContext.Current.Response.Clear();
         HttpContext.Current.Response.AddHeader("Content-Type", "application/octet-stream");
         HttpContext.Current.Response.Charset = "utf-8";

         string filename = file.Name;
         string userAgent = HttpContext.Current.Request.ServerVariables["http_user_agent"].ToLower();
         //处理firefox保存时文件名乱码的问题
         if (userAgent.IndexOf("firefox") == -)
             filename = HttpUtility.UrlEncode(filename, System.Text.Encoding.UTF8);

         HttpContext.Current.Response.AddHeader("Content-Disposition", "attachment;filename=" + filename);
         HttpContext.Current.Response.AddHeader("Content-Length", file.Length.ToString());
         HttpContext.Current.Response.WriteFile(file.FullName);
         HttpContext.Current.Response.Flush();
         HttpContext.Current.Response.Clear();
         HttpContext.Current.Response.End();
     }