public ConferenceAlias GetConferenceAlias(string conferenceCode)
        {
            var key        = "ConferenceDao_Alias_" + conferenceCode;
            var conference = cache.Get(key) as ConferenceAlias;

            if (conference == null)
            {
                conference = decoratedDao.GetConferenceAlias(conferenceCode);
                if (conference != null)
                {
                    cache.Set(key, conference, new CacheItemPolicy {
                        AbsoluteExpiration = DateTimeOffset.UtcNow.AddMinutes(20)
                    });
                }
            }

            return(conference);
        }