public void RemoveGame(int gameId) { var removeWhat = AllChannelsCollection.FirstOrDefault(kgc => kgc.ChannelId == gameId); if (removeWhat != null) { AllChannelsCollection.Remove(removeWhat); } // Old: Games.RemoveAll(kgi => kgi.ChannelId == gameId); Challenges.RemoveAll(kgi => kgi.ChannelId == gameId); }