Who can help me about the token of Google Api V3 Calendar, please ?

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.NET

request

google-api

Hy,

Who can help me about the token of Google Api V3 Calendar, please ?

I configure all parameters of my Google Project but I've some problem to having a token with this code :

public UserToken GetUserTokenByCode(string sCode, Credential credential)
        {
            UserToken MyToken = new UserToken();

            string url = credential.token_uri.ToString(); ///-- "https://accounts.google.com/o/oauth2/token";

            StringBuilder postDataBuider = new StringBuilder();
            postDataBuider.Append("code=" + sCode); // the code for the Google GMAIL.COM
            postDataBuider.Append("&client_id=" + credential.client_id.ToString()); 
            postDataBuider.Append("&client_secret=" + credential.client_secret.ToString()); 
            postDataBuider.Append("&scope=" + UrlEncodeForGoogle("https://www.googleapis.com/auth/calendar").Replace("%20", "+"));
            postDataBuider.Append("&redirect_uri=" + credential.redirect_uris[0].ToString());
            postDataBuider.Append("&grant_type=authorization_code");
            
            string postDataStr = postDataBuider.ToString();
            
            byte[] postDataBytes = System.Text.Encoding.UTF8.GetBytes(postDataStr);

            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
            request.Accept = "application/json";
            request.Method = "POST";
            request.ContentType = "application/x-www-form-urlencoded";
            request.ContentLength = postDataBytes.Length;

            Stream dataStream = request.GetRequestStream();
            dataStream.Write(postDataBytes, 0, postDataBytes.Length);
            dataStream.Close();

            string responseStr = "";
            try
            {
                using (HttpWebResponse response = (HttpWebResponse)request.GetResponse())
                {
                    using (Stream responseStream = response.GetResponseStream())
                    {
                        using (StreamReader readStream = new StreamReader(responseStream, Encoding.UTF8))
                        {
                            responseStr = readStream.ReadToEnd();

                            if (String.Empty == responseStr)
                            {
                                throw new Exception("Response is null or empty");
                            }
                            else
                            {
                                JObject token = JObject.Parse(responseStr);

                                MyToken.access_token = (token["access_token"]).ToString();
                                MyToken.expires_in = (token["expires_in"]).ToString();
                                MyToken.refresh_token = (token["refresh_token"]).ToString();
                                MyToken.token_type = (token["token_type"]).ToString();
                                MyToken.Refreshdate = DateTime.Now;

                            }
                        }
                    }
                }
            }
            catch 
            { }

            return MyToken;
        }

Thank you for your help.