mtgox signin c#

 public void getBalanceV2()
        {
            RestRequest req = signRequestV2(new RestRequest("money/info", Method.POST));
            var resp = rc2.Execute<dynamic>(req);
        }

        public RestRequest signRequestV2(RestRequest req)
        {
            String apiKey = ConfigurationManager.AppSettings["MtGoxAPIKey"];
            String apiSecret = ConfigurationManager.AppSettings["MtGoxApiSecret"];

            TimeSpan span = DateTime.Now - UnixEpoch;
            double seconds = span.TotalSeconds * 10000;
            Int64 nonce = (Int64)seconds;

            string endpoint = req.Resource.ToString();
            string post = "nonce=" + nonce;
            string prefix = endpoint;

            string sign = getHash(Convert.FromBase64String(apiSecret), prefix + Convert.ToChar(0) + post);
            req.AddHeader("Rest-Key", apiKey);
            req.AddHeader("Rest-Sign", sign);
            req.AddParameter("nonce", nonce);

            return req;
        }

        public string getHash(byte[] keyByte, String message)
        {
            var hmacsha512 = new HMACSHA512(keyByte);
            var messageBytes = encoding.GetBytes(message);
            return Convert.ToBase64String(hmacsha512.ComputeHash(messageBytes));
        }