online timer

hi. iam developing online exam.i need to set online exam time. so i am using time ElapsedEventHandler.but i can't redirect other page if time over..please help me..can u explain time ElapsedEventHandler method.

  protected void Page_Load(object sender, EventArgs e)
    {

        mytimer.Elapsed += new ElapsedEventHandler(ClosePage);
        mytimer.Interval = 10000;
        mytimer.Enabled = true;
        Console.ReadLine();
        GC.KeepAlive(mytimer );        
    }
    
    private static void ClosePage(object sender, ElapsedEventArgs e)
    {
        mytimer.Enabled = false;
& ...