Hi,
Thanks for the link, it's very helpful. 
So I wrote another post method to get a renew token, however I am getting 
error "(400) Bad Request.".
is it because the application I defined as a "web application" (I got my 
first accesstoken from the call back link) not "Installed Application" ? 



        public GoogleAccessTokenData 
GetAccessTokenDataFromRefreshToken(string authorizationCode, string 
refreshToken)
        {
            string Url = "https://accounts.google.com/o/oauth2/token";;
            string data = 
"code={0}&client_id={1}&client_secret={2}&refresh_token={3}&grant_type=refresh_token";

            HttpWebRequest request = HttpWebRequest.Create(Url) as 
HttpWebRequest;
            string result = null;
            request.Method = "POST";
            request.KeepAlive = true;
            request.ContentType = "application/x-www-form-urlencoded";
            string param = string.Format(data, authorizationCode, 
_GoogleClientId, _GoogleSecret, refreshToken);
            var bs = Encoding.UTF8.GetBytes(param);
          *  using (Stream reqStream = request.GetRequestStream())  <=== 
exception thrown with error "(400) Bad Request**"*
            {
                reqStream.Write(bs, 0, bs.Length);
            }

            using (WebResponse response = request.GetResponse())
            {
                var sr = new StreamReader(response.GetResponseStream());
                result = sr.ReadToEnd();
                sr.Close();
            }
            var jsonSerializer = new JavaScriptSerializer();
            var tokenData = 
jsonSerializer.Deserialize<GoogleAccessTokenData>(result);
            return tokenData;
        }

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