private string GetRandomTweetForUser(string screenName, int maxTweets)
        {
            string result = string.Empty;

            var twitterHelper = UserStateRepository.GetTwitterHelper();

            var random = new Random();

            string timeLineUrlFormat = ConfigurationManager.AppSettings["twitterTimeLineUrlFormat"];

            var timeLineRequestSettings = new TimeLineRequestSettings {
                Count = maxTweets,
                ExcludeReplies = true,
                IncludeRts = true,
                RequestUrlFormat = timeLineUrlFormat,
                ScreenName = screenName,
                TrimUser = true
            };

            var timeLineJson = twitterHelper.GetTimelineJson(timeLineRequestSettings);
            var timeLineItems = JsonConvert.DeserializeObject<List<TimeLine>>(timeLineJson);

            if (timeLineItems == null || timeLineItems.Count == 0) {
                result = string.Empty;
            }
            else if (timeLineItems.Count == 1) {
                result = timeLineItems[0].Text;
            }
            else {
                int randomIndexForTimeLineItem = random.Next(0, timeLineItems.Count);
                var randomTimeLineItem = timeLineItems[randomIndexForTimeLineItem];
                result = randomTimeLineItem.Text;
            }

            return result;
        }
        public string GetTimelineJson(TimeLineRequestSettings requestSettings)
        {
            var timeLineJson = string.Empty;
            var authResponse = Authenticate();
            var url = requestSettings.BuildRequestUrl();

            timeLineJson = JsonUtil.RequestJson(url, authResponse.TokenType, authResponse.AccessToken);

            return timeLineJson;
        }