C# sample for getting a Concur OAuth token via native flow

OAuthSample.cs

        /// <summary>
        /// Get a Concur OAuth token using the "Native Flow"
        /// </summary>
        /// <param name="loginID">Concur login ID of the user that is requesting the token</param>
        /// <param name="password">Password for the specified user</param>
        /// <param name="appKey">Application authorization key identifying the application that the token will access 
        ///                     (the "Key" field from the "New/Modify Partner Application" dialog box on the Web Services administration page.)</param>
        /// <returns>Access token, good for one year.</returns>
        public string GetOAuthToken(string loginID, string password, string appKey)
        {
            // Base-64 encode the credentials for basic auth
            string encodedCredentials = Convert.ToBase64String(Encoding.ASCII.GetBytes(loginID + ":" + password));

            // Create the request and add the credentials and app key to the HTTP headers
            HttpWebRequest req = (HttpWebRequest)WebRequest.Create("https://www.concursolutions.com/net2/oauth2/accesstoken.ashx");
            req.Method = "GET";
            req.Headers.Add("Authorization", "Basic " + encodedCredentials);
            req.Headers.Add("X-ConsumerKey", appKey);

            // Make the request and get the response
            HttpWebResponse resp = (HttpWebResponse)req.GetResponse();

            // Load the XML response and parse the token 
            XmlDocument doc = new XmlDocument();
            doc.Load(resp.GetResponseStream());
            string token = doc.SelectSingleNode("/Access_Token/Token").InnerText;

            return(token);
        }