public IEnumerable<ISession> GetSessions()
        {
            var result = new List<ISession>();
            SiteEntity currSite;
            try
            {
                using (var dbContext = new AuctionSiteDbContext(_connectionString))
                {
                    currSite = dbContext.Sites
                        .Where(x => x.Name.Equals(Name))
                        .Include(x => x.Sessions.Select(y=> y.UserEntity))
                        .FirstOrDefault();
                }
                if (currSite == null)
                    throw new InvalidOperationException();

            }
            catch (Exception e)
            {
                InCommon.ExceptionCatching(e, null);
                throw;
            }
            foreach (var sessionEntity in currSite.Sessions)
            {
                 result.Add(new Session(this, _connectionString, _alarmClock, sessionEntity.SessionId, sessionEntity.ValidUntil, new User(_connectionString, this, _alarmClock, sessionEntity.UserEntity.Username)));
            }
            return result;
        }