C#

protected override void CreateChildControls()
        {
            base.CreateChildControls();

            try
            {

                if (ScriptManager.GetCurrent(this.Page) == null)
                {
                this.Controls.Add(new ScriptManager()
                {

                    EnablePartialRendering = true
                });
                }

                

                UpdatePanel updatePanel = new UpdatePanel();
                updatePanel.UpdateMode = UpdatePanelUpdateMode.Always;
                this.Controls.Add(updatePanel);
                

                lblTimer = new Label();
                lblTimer.Text = DateTime.Now.ToString();
                updatePanel.ContentTemplateContainer.Controls.Add(lblTimer);

                

                Timer timer = new Timer();
                timer.Enabled = true;
                timer.Interval = 2000;
                timer.Tick += new EventHandler<EventArgs>(t_Tick);
                

            }
            catch (Exception ex2)
            {
                Literal ex2b = new Literal();
                ex2b.Text = ex2.ToString();
                this.Controls.Add(ex2b);
            }

}



        protected void t_Tick(object sender, EventArgs e)
        {
            lblTimer.Text = DateTime.Now.ToLongTimeString();
        }