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Page.Response.Clear();
bool success = ResponseFile(Page.Request, Page.Response, "Ä¿µÄÎļþÃû³Æ", @"Ô´Îļþ·¾¶", 1024000);
if (!success)
      Response.Write("ÏÂÔØÎļþ³ö´í£¡");
Page.Response.End();
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public static bool ResponseFile(HttpRequest _Request,HttpResponse _Response,string _fileName,string _fullPath, long _speed)
    {
        try
        {
             FileStream myFile = new FileStream(_fullPath, FileMode.Open, FileAccess.Read, FileShare.ReadWrite);
             BinaryReader br = new BinaryReader(myFile);
            try
            {
                 _Response.AddHeader("Accept-Ranges", "bytes");
                 _Response.Buffer = false;
                long fileLength = myFile.Length;
                long startBytes = 0;
     
                double pack = 10240; //10K bytes
                //int sleep = 200;   //ÿÃë5´Î    ¼´5*10K bytesÿÃë
                int sleep = (int)Math.Floor(1000 * pack / _speed) + 1;
 


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