问一个浏览器兼容的问题

[小雄]

最近在一个网站，需要用到弹出框，代码如下：

 protected void Button1_Click(object sender, EventArgs e)
    {
        //1
        string script = string.Format(CultureInfo.CurrentCulture, "<script>alert('{0}');</script>", "弹出框"); 
        this.Page.ClientScript.RegisterStartupScript(this.Page.GetType(), "提示", script);
        //2
        Response.Write("<script type='text/javascript'>alert('ssss');</script>");
    }

由于客户用到的是IE9跟IE11。。在11下是正常能弹出的。为嘛在9下无效。
ps：2种方法都试过了。。

然后还有一段下载文件的代码：

 /// <summary>
        /// 下载指定路径的文件
        /// </summary>
        /// <param name="filePath">相对路径文件,如"~\Upload\Test.xls"</param>
        public static void DownloadFile(string filePath)
        {
            string path = HttpContext.Current.Server.MapPath(filePath);
            FileInfo toDownload = new FileInfo(path);

            if (toDownload.Exists)
            {
                const int chunkSize = 10000;
                byte[] buffer = new byte[chunkSize];

                HttpContext.Current.Response.Clear();
                using (FileStream stream = File.OpenRead(path))
                {
                    long dataLengthToRead = stream.Length;
                    HttpContext.Current.Response.ContentType = "application/octet-stream";
                    HttpContext.Current.Response.AddHeader("Content-Disposition", "attachment; filename=" + HttpContext.Current.Server.UrlEncode(toDownload.Name));
                    while (dataLengthToRead > 0 && HttpContext.Current.Response.IsClientConnected)
                    {
                        int lengthRead = stream.Read(buffer, 0, chunkSize);
                        HttpContext.Current.Response.OutputStream.Write(buffer, 0, lengthRead);
                        HttpContext.Current.Response.Flush();
                        dataLengthToRead = dataLengthToRead - lengthRead;
                    }
                }

                HttpContext.Current.Response.Close();

            }
        }

这个在IE9下面也是无效的。。求解。求指导。。

[rayyu1989]

按F12 在控制台中看看js报什么错误

[by_封爱]

public static void show(Page page, string str)
{
    page.ClientScript.RegisterStartupScript(page.GetType(), "", "<script language='javascript'>alert('" + str + "');</script>");
}

上面的代码从6运行到11 (IE) 并且用了5年以上 没问题..

[by_封爱]

public static 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";
        HttpContext.Current.Response.AddHeader("Content-Disposition", "attachment;filename=" + System.Web.HttpUtility.UrlEncode(file.Name, System.Text.Encoding.UTF8));
        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();
    }

这个代码也经历了很多年 很多版本的IE也没什么问题..