Dmap.Server.ExpireSessions C# (CSharp) Метод

        private void ExpireSessions()
        {
            lock (sessions) {
                foreach (int s in new List<int> (sessions.Keys)) {
                    User user = sessions[s];

                    if (DateTime.Now - user.LastActionTime > DefaultTimeout) {
                        sessions.Remove (s);
                        OnUserLogout (user);
                    }
                }
            }
        }