BoxKite.Twitter.Authentication.TwitterAuthenticator.StartApplicationOnlyAuth C# (CSharp) Method

        public static async Task<bool> StartApplicationOnlyAuth(this IApplicationSession appsession)
        {
            if (string.IsNullOrEmpty(appsession.clientID))
                throw new ArgumentException("Twitter Consumer Key is required for Application only Auth");
            if (string.IsNullOrEmpty(appsession.clientSecret))
                throw new ArgumentException("Twitter Consumer Secret is required for Application only Auth");

            // ref: https://dev.twitter.com/docs/auth/application-only-auth
            // and ref: http://tools.ietf.org/html/rfc6749#section-4.4

            var oAuth2TokenUrlPostRequestRfc6749 = new SortedDictionary<string, string>
            {
                {"grant_type", "client_credentials"}
            };

            var result = await appsession.PostAsync(TwitterApi.OAuth2TokenUrl(), oAuth2TokenUrlPostRequestRfc6749, forInitialAuth: true);
            if (!result.IsSuccessStatusCode)
                return false;
            var content = await result.Content.ReadAsStringAsync();
            var jresponse = JObject.Parse(content);
            appsession.bearerToken = (string) jresponse["access_token"];
            appsession.IsActive = true;
            return true;
        }