public async Task <IEntry <TwitterContact> > FetchAsync(ulong id) { try { var user = await _client.GetUserAsync(id); return(_entryFactory.Create( new TwitterContact( ((ulong?)user.Id).GetValueOrDefault(id), user.Name, user.ScreenName, $"https://twitter.com/{user.ScreenName}" ) )); } catch (TwitterException e) { if (e.Status == HttpStatusCode.NotFound) { throw new ContactNotFoundException <TwitterContact>(e); } throw; } }