Zippyshare download c#

zippyshare.cs

public class WebClientEx : WebClient
{
        public WebClientEx()
    {
    }
    public WebClientEx(CookieContainer container)
    {
        this.container = container;
    }

    public CookieContainer CookieContainer
        {
            get { return container; }
            set { container= value; }
        }

    private CookieContainer container = new CookieContainer();

    protected override WebRequest GetWebRequest(Uri address)
    {
        WebRequest r = base.GetWebRequest(address);
        var request = r as HttpWebRequest;
        if (request != null)
        {
            request.CookieContainer = container;
        }
        return r;
    }

    protected override WebResponse GetWebResponse(WebRequest request, IAsyncResult result)
    {
        WebResponse response = base.GetWebResponse(request, result);
        ReadCookies(response);
        return response;
    }

    protected override WebResponse GetWebResponse(WebRequest request)
    {
        WebResponse response = base.GetWebResponse(request);
        ReadCookies(response);
        return response;
    }

    private void ReadCookies(WebResponse r)
    {
        var response = r as HttpWebResponse;
        if (response != null)
        {
            CookieCollection cookies = response.Cookies;
            container.Add(cookies);
        }
    }
}

public class Zippyshare
{
  public static void Downloadfile(string fileUrl)
  {
      Match m = Regex.Match(fileUrl,  @"https?://((?:[\w\-]+))\.*zippyshare\.com/\w/(\w+)", RegexOptions.IgnoreCase);
      if(!m.Success)
      {
          Console.WriteLine("Invalid zippyshare link!");
          return;
      }
      var server = m.Groups[1].Captures[0].Value;
      var fid = m.Groups[2].Captures[0].Value;

      using(WebClientEx client = new WebClientEx())
      {
          string website = client.DownloadString(fileUrl);
          string regex = "File does not exist on this server";
          Match match = Regex.Match(website, regex, RegexOptions.IgnoreCase);
          regex = "File has expired and does not exist anymore on this server";
          Match match2 = Regex.Match(website, regex, RegexOptions.IgnoreCase);
          if(match.Success || match2.Success)
          {
              Console.WriteLine("File doesn't exist!");
              return;
          }
          
          var match = Regex.Match(website, @"document\.getElementById\('dlbutton'\)\.href = ""/(pd|d)/(.*)/"" \+ \(([0-9]+) % ([0-9]+) \+ ([0-9]+) % ([0-9]+)\) \+ ""/(.*)"";", RegexOptions.IgnoreCase);
          if (!match.Success)
	      return;
          if (match.Groups.Count != 6)
              return;
	  var fileId = match.Groups[1].Captures[0].Value;
	  var a = int.Parse(match.Groups[2].Captures[0].Value);
	  var b = int.Parse(match.Groups[3].Captures[0].Value);
	  var c = int.Parse(match.Groups[4].Captures[0].Value);
	  var d = int.Parse(match.Groups[5].Captures[0].Value);
	  var fileName = match.Groups[6].Captures[0].Value;
	  var num = a % b + c % d;

          client.DownloadFile("http://"+server+".zippyshare.com/d/"+fileId+"/" + num + "/"+fileName, fileName);
      }

      Console.WriteLine("Downloading: " + "http://"+server+".zippyshare.com/d/"+fid+"/" + finalDivide + "/"+fileName);
  }
}