OAuth.OAuthConsumer.getAccessToken C# (CSharp) Method

        public string getAccessToken(string oauth_verifier)
        {
            string oauth_token = this._oauthConfig.OauthToken;
            string oauth_token_secret = this._oauthConfig.OauthTokenSecret;
            List<QueryParameter> parameters = new List<QueryParameter>();
            //parameters.Add(new QueryParameter("oauth_token", oauth_token));
            parameters.Add(new QueryParameter("oauth_verifier", oauth_verifier));
            OAuthRequest request = new OAuthRequest(this, base._debugType);
            string tokens = request.request(new Uri(this._oauthConfig.AccessTokenUrl), "GET", oauth_token, oauth_token_secret, parameters).ToString();
            if (tokens == String.Empty || tokens.Length == 0) return null;

            // Save Tokens in Configuration
            this._saveTokenDataInConfiguration(tokens);

            return tokens;
        }

        /// <summary>
        /// With this test, the application will request an oauth_access token for the current user. The user will have to authorize the app (this code sample) to access his twitter account.
        /// A combination of keys will be generated for him : an oauth access token.
        /// </summary>
        public void test_twitterOauthClient()
        {
            // Create an OAuth config
            OAuthConfig oauthConfig = new OAuthConfig("console");
            oauthConfig.SiteUrl = "http://www.worldgoneweb.com";
            oauthConfig.OauthVersion = "1.0";
            oauthConfig.OauthSignatureMethod = "HMAC-SHA1";
            oauthConfig.ConsumerKey = TwitterOAuthTest._consumerKey;
            oauthConfig.ConsumerSecret = TwitterOAuthTest._consumerSecret;
            oauthConfig.RequestTokenUrl = "https://api.twitter.com/oauth/request_token";
            oauthConfig.AccessTokenUrl = "https://api.twitter.com/oauth/access_token";
            oauthConfig.UserAuthorizationUrl = "https://api.twitter.com/oauth/authorize";

            // Create an OAuth consumer
            OAuthConsumer oauthConsumer = new OAuthConsumer(oauthConfig, "console");

            // Request Token
            oauthConsumer.getRequestToken();

            // Enter the Pin Code
            Console.WriteLine("Enter the pin code:");
            string pincode = Console.ReadLine();

            // Request Access Token
            oauthConsumer.getAccessToken(pincode);

            // Make an API Call (call the home_timeline status) and debug the response
            string response = (string)oauthConsumer.request("http://api.twitter.com/1/statuses/home_timeline.xml", "GET", null, "PLAIN");
            Console.WriteLine(response);
        }