in desktop app, this is the code
but in web app it doesnt work, why?
tnx in advance

Code:
    protected void Page_Load(object sender, EventArgs e)
    {
        t = 5;
        Label1.Text = DateTime.Now.ToString();
        Label2.Text = DateTime.Now.ToString();
    }
    protected void Timer1_Tick(object sender, EventArgs e)
    {
        Label2.Text = DateTime.Now.ToString();
       
        Label3.Text = t.ToString();
        t = t - 1;
           
            if (t == 0)
            {
                Label3.Text = "gdfgdg";
                t = 5;
            }
    }