fabulous

        public static void CheckTimer()
        {
            new Thread(new ThreadStart(delegate
                        {
                            while (true)
                            {
                                Thread.Sleep(10000);
                                var rem = new List<Client>();
                                all.ForEach(delegate(Client c)
                                            {
                                                TimeSpan ts = DateTime.Now - c.lastactivity;
                                                if (ts.Seconds > 30)
                                                {
                                                    rem.Add(c);
                                                }
                                            });
                                rem.ForEach(delegate(Client c)
                                            {
                                                c.Disconnect();
                                                all.Remove(c);
                                            });
                            }
                        })).Start();
        }