public static Socket ConnectToSocks5Proxy(string proxyAdress, ushort proxyPort, string destAddress, ushort destPort,
         string userName, string password)
        {
            IPAddress destIP = null;
            IPAddress proxyIP = null;
            byte[] request = new byte[257];
            byte[] response = new byte[257];
            byte[] tmpBuffer = new byte[40];

            proxyIP = IPAddress.Parse(proxyAdress);                     

            destIP = IPAddress.Parse(destAddress);

            IPEndPoint proxyEndPoint = new IPEndPoint(proxyIP, proxyPort);
          
            Socket s = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
            s.Connect(proxyEndPoint);

            String temp;

            temp = String.Format("CONNECT 127.0.0.1:443 HTTP/1.1\r\nUser-Agent: Mozilla/5.0 (compatible; MSIE 10.0; Windows NT 6.1; WOW64; Trident/6.0)\r\n Proxy-Connection: Keep-Alive\r\n Proxy-Authorization: Basic YWRyZDExMTphZDgxOA== \r\n\r\n", destAddress, destPort);
            request = System.Text.Encoding.ASCII.GetBytes(temp);
            s.Send(request, temp.Length, SocketFlags.None);
            s.Receive(response); // Get variable length response...
            String tempstr = System.Text.Encoding.UTF8.GetString(response);
            if (tempstr.Substring(9, 3) == "200")
            {
                return s;
            }
            return null;
        }