// GET api/<controller>
        public IEnumerable <CalendarEvent> Get()
        {
            if (_cachedEvents == null)
            {
                _cachedEvents = new ExpiringCache <IEnumerable <CalendarEvent> >(GetEvents(null, null),
                                                                                 TimeSpan.FromMinutes(int.Parse(ConfigurationManager.AppSettings["GoogleCalendarMinutesToCacheEvents"])));
            }
            else if (_cachedEvents.IsExpired())
            {
                _cachedEvents.Refresh(GetEvents(null, null));
            }

            return(_cachedEvents.Item);
        }