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<%@ Page Language="C#" AutoEventWireup="true" Async="true" ...

private  QDownloadParam QDownload(QDownloadParam param)
    {
         //  Create the HttpWebRequest Object
        param.Status =  "  Connecting... ("  + param.Link +  "  )" ;
        param.Worker.ReportProgress( 1 , param);
        var URL =  new  Uri(param.Link.Trim());
        var req = (HttpWebRequest)WebRequest.Create(URL);
         //  Alow Auto Redirections, because after Authentications, links going to be changed.
        req.AllowAutoRedirect =  true ;
 
         //  check if the user set the Credentials or not
         if  (!string.IsNullOrEmpty(param.Username))
        {
             //  Assigning Basic Authorization HTTP Header to HttpWebRequest
             byte [] authBytes = Encoding.UTF8.GetBytes((param.Username +  "  :"  + param.Password).ToCharArray());
            req.Headers[ "  Authorization" ] =  "  Basic "  + Convert.ToBase64String(authBytes);
        }
        req.MaximumAutomaticRedirections =  4 ;
         //  User Agent Set as Firefox
        req.UserAgent =  "  Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1)" ;
         //  Accept any kind of files!
        req.Accept =  "  */*" ;
        req.KeepAlive =  true ;
        req.Timeout =  9999999 ;  //  prefRequestTimeout
         //  Search for the Authentication cookies
        req.CookieContainer = GetUriCookieContainer(URL.AbsoluteUri);
         //   Get the stream from the returned web response
        HttpWebResponse webresponse =  null ;
         try
        {
            webresponse = (HttpWebResponse)req.GetResponse();
             //  Check if the Response Redirect occurred or not
             if  (webresponse.ResponseUri.AbsoluteUri != URL.AbsoluteUri)
            {
                param.Link = webresponse.ResponseUri.AbsoluteUri;
                param.Status =  "  Redirecting... ("  + param.Link +  "  )" ;
                param.Worker.ReportProgress( 1 , param);
                QDownload(param);  return  param;
            }
            param.Status =  "  Connected. ("  + param.Link +  "  )" ;
            param.Worker.ReportProgress( 1 , param);
        }
         catch  (WebException e)
        {
            param.Status =  "  error: "  + e;
            param.Worker.ReportProgress(-1, param);
             return  param;
        }
 
         try
        {
             //  Get the File and write it to path
            var file = Path.GetFileName(webresponse.ResponseUri.AbsoluteUri);
             if  (!webresponse.ContentType.Contains( "  text/html" ))
            {
                file = file.Replace( "  .html" ,  "  " );
            }
             else
            {
 
                param.Status =  "  Check the Username or Password!" ;
                param.Worker.ReportProgress(-1, param);
                 if  (SkipOnError)
                {
                    param.Status =  "  Download Skip. "  + param.Link;
                     return  param;
                }
            }
            param.FileName = file;
            param.Status =  "  Downloading File: "  + file +  "  ("  + (webresponse.ContentLength /  1000 ) +  "  KB)" ;
            param.Worker.ReportProgress( 1 , param);
             string  filepath;
             if  (param.FileDirectory.EndsWith( "  \\")) filepath = param.FileDirectory + file;
            else
            {
                filepath = param.FileDirectory + " \\ "   + file;
            }
            var writeStream = new FileStream(filepath, FileMode.Create, FileAccess.ReadWrite);
            var readStream = webresponse.GetResponseStream();
            try
            {
                const int Length = 256;//Set the buffer Length
                var buffer = new Byte[Length];
                int bytesRead = readStream.Read(buffer, 0, Length);
                // write the required bytes
                while (bytesRead > 0)
                {
                    if (param.Worker.CancellationPending) return param;
                    writeStream.Write(buffer, 0, bytesRead);
                    bytesRead = readStream.Read(buffer, 0, Length);
                    int Percent = (int)((writeStream.Length * 100) / webresponse.ContentLength);
                    param.Progress = Percent;
                    param.Worker.ReportProgress(2, param);
                }
                readStream.Close();
                writeStream.Close();
 
            }
            catch (Exception exception)
            {
                param.Status = " error:  "   + exception;
                param.Worker.ReportProgress(-1, param);
                return param;
            }
            param.Status = " Download Finish:  "   + file;
            param.Worker.ReportProgress(1, param);
        }
        catch (Exception exception)
        {
            param.Status = " error:  "   + exception;
            param.Worker.ReportProgress(-1, param);
            return param;
        }
        return param;
 
    }