private async Task<long> GetSearchTimeLine_Failover(long sinceid)
{
var largestseenid = sinceid;
var searchtl = await TwitterSession.SearchFor(searchText: _currentSearchText, searchResponseType: SearchResultType.Recent, count: _pagingSize, sinceId: sinceid);
if (!searchtl.OK) return largestseenid;
foreach (var tweet in searchtl.Tweets.Where(tweet => tweet.Id > sinceid))
{
if (tweet.Id > sinceid) largestseenid = tweet.Id;
_searchtimeline.OnNext(tweet);
}
return largestseenid;
}