Console.Out.WriteLine("Making withdraw request to Mt. Gox...");
            
            HttpWebRequest request = 
                (HttpWebRequest)WebRequest.Create("https://mtgox.com/api/0/withdraw.php");
            request.Method = WebRequestMethods.Http.Post;
            request.UserAgent = "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.2; .NET CLR 1.0.3705;)";

            String btcAddr = mainForm.getSendToBitcoinAddress();
            String btcAmount = .01;

            String nonce = DateTime.UtcNow.Millisecond.ToString();
            Console.Out.WriteLine("nonce: " + nonce);
         
            string postData = "group1=BTC&btca=" + btcAddr + "&amount=" 
                                    + btcAmount + "&nonce=" + nonce;

            String key = "xxxxxxxxxxxxxxxxxxx";
            String keySecret = "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx";
            byte[] keyByte = Convert.FromBase64String(keySecret);
            HMACSHA512 hmacsha512 = new HMACSHA512(keyByte);

            System.Text.ASCIIEncoding encoding = new System.Text.ASCIIEncoding();
            byte[] messageBytes = encoding.GetBytes(postData);
            byte[] hashmessage = hmacsha512.ComputeHash(messageBytes);
            String base64SignedPostData = Convert.ToBase64String(hashmessage);

            request.Headers.Add("Rest-Key", key);
            request.Headers.Add("Rest-Sign", base64SignedPostData);

            byte[] byteArray = Encoding.UTF8.GetBytes(postData);
            request.ContentType = "application/x-www-form-urlencoded";
            request.ContentLength = byteArray.Length;
            Stream dataStream = request.GetRequestStream();
            dataStream.Write(byteArray, 0, byteArray.Length);
            dataStream.Close();

            WebResponse response = request.GetResponse();
            Console.WriteLine(((HttpWebResponse)response).StatusDescription);
            dataStream = response.GetResponseStream();
            StreamReader reader = new StreamReader(dataStream);
            string responseFromServer = reader.ReadToEnd();

            Console.WriteLine(responseFromServer);

            //Clean up the streams.
            reader.Close();
            dataStream.Close();
            response.Close();