ForumServer.ServerController.ListenOnForum C# (CSharp) Метод

        public bool ListenOnForum(string username, string subForumName)
        {
            if (subscribed.ContainsKey(username))
            {
                lock (subscribed[username])
                {
                    subscribed.TryAdd(username, subForumName);
                    return true;
                }
            }
            else
            {
                return false;
            }
        }