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 protected void Page_Load(object sender, EventArgs e)
    {
        string filename = Server.UrlDecode(Request["upload"]);
        string filePath = Server.MapPath("upload/" + filename);//·¾¶
        FileDownload(filePath);
    }
/// <summary>
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    /// <param name="FullFileName"> </param>
    private void FileDownload(string FullFileName)
    {
        try
        {
            FileInfo DownloadFile = new FileInfo(FullFileName);
            if (DownloadFile.Exists)
            {
                Response.Clear();
                Response.ClearHeaders();
                Response.Buffer = false;
                //Response.ContentType = "application/octet-stream";//֪ͨä¯ÀÀÆ÷ÏÂÔØÎļþ¶ø²»ÊÇ´ò¿ª
                Response.AppendHeader("Content-Disposition", "attachment;filename=" + HttpUtility.UrlEncode(DownloadFile.FullName, System.Text.Encoding.UTF8));
                Response.AppendHeader("Content-Length", DownloadFile.Length.ToString());
    &nb


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