You could use a timer, declared in global.asax, like this:

    void Application_Start(object sender, EventArgs e)
    {
        System.Timers.Timer timer = new System.Timers.Timer();
        timer.Interval = 2000 * 60;
        timer.Elapsed += Myhandler;
        timer.Start();

        Application.Add("timer", timer);
    }

    static void Myhandler(object sender, System.Timers.ElapsedEventArgs e)
    {
    }