private void ChatClientOnUserLeft(object sender, UserStatusEventArgs eventArgs)
        {
            _chatUserCollection.GetOrCreateChatUser(eventArgs.DisplayName, eventArgs.ToChatUser());

            _chatUserCollection.StopWatching(eventArgs.DisplayName);
        }
 private void ChatClientOnOnUserNoticed(object sender, UserStatusEventArgs eventArgs)
 {
     WatchUserIfNeeded(eventArgs.DisplayName, eventArgs.ToChatUser());
 }