BoxKite.Twitter.TwitterConnection.GetRTOfMe_Failover C# (CSharp) Method

        private async Task<long> GetRTOfMe_Failover(long sinceid)
        {
            var largestseenid = sinceid;

            var rtofme = await UserSession.GetRetweetsOfMe(count: _pagingSize, sinceId: sinceid);
            if (!rtofme.OK) return largestseenid;
            foreach (var tweet in rtofme.Where(tweet => tweet.Id > sinceid))
            {
                largestseenid = tweet.Id;
                _mentions.OnNext(tweet);
            }
            return largestseenid;
        }