public static ISession GetSession()
    {
        ISessionFactory holder = ActiveRecordMediator.GetSessionFactoryHolder();
        ISessionScope activeScope = holder.ThreadScopeInfo.GetRegisteredScope();
        ISession session = null;
        var key = holder.GetSessionFactory(typeof(ActiveRecordBase));
        if (activeScope == null)
        {
            session = holder.CreateSession(typeof(ActiveRecordBase));
        }
        else
        {
            if (activeScope.IsKeyKnown(key))
                session = activeScope.GetSession(key);
            else
                session = holder.GetSessionFactory(typeof(ActiveRecordBase)).OpenSession();
        }

        return session;
    }