asp.net using c#( countdown timer)

Timer t = new Timer(2000);
int timerCounter = 20;
t.Elapsed += delegate(object sender, ElapsedEventArgs args)
    {
        --timerCounter;
        if (timerCounter > 0)
        {
            Console.WriteLine("Counter = " + timerCounter + ", Time is " + DateTime.Now.ToLongTimeString());
        }
        else
        {
            Console.WriteLine("Time expired, Time is " + DateTime.Now.ToLongTimeString());
            // Whatever to do after timer expires
            t.Stop();
        }
    };
t.Start();