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//TransmitFileʵÏÖÏÂÔØ
    protected void Button1_Click(object sender, EventArgs e)
    {
        /*
         ΢ÈíΪResponse¶ÔÏóÌṩÁËÒ»¸öÐµķ½·¨TransmitFileÀ´½â¾öʹÓÃResponse.BinaryWrite
         ÏÂÔØ³¬¹ý400mbµÄÎļþʱµ¼ÖÂAspnet_wp.exe½ø³Ì»ØÊÕ¶øÎÞ·¨³É¹¦ÏÂÔØµÄÎÊÌâ¡£
         ´úÂëÈçÏ£º
         */
        Response.ContentType = "application/x-zip-compressed";
        Response.AddHeader("Content-Disposition", "attachment;filename=z.zip");
        string filename = Server.MapPath("DownLoad/z.zip");
        Response.TransmitFile(filename);
    }
    //WriteFileʵÏÖÏÂÔØ
    protected void Button2_Click(object sender, EventArgs e)
    {
        /*
         using System.IO;
        
         */
        string fileName = "asd.txt";//¿Í»§¶Ë±£´æµÄÎļþÃû
        string filePath = Server.MapPath("DownLoad/aaa.txt");//·¾¶
        FileInfo fileInfo = new FileInfo(filePath);
        Response.Clear();
        Response.ClearContent();
        Response.ClearHeaders();
        Response.AddHeader("Content-Disposition", "attachment;filename=" + fileName);
        Response.AddHeader("Content-Length", fileInfo.Lengt


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