มีใครพอทราบวิธีทำให้โปรแกรม Logoff ออกอัตโนมัติไหมครับ

private void Form_Activated(object sender, EventArgs e)
        {
            timer1.Stop();
            timer1.Enabled = false;
        }

        private void Form_Deactivate(object sender, EventArgs e)
        {
            timer1.Enabled = true;
            timer1.Tick += new EventHandler(timer1_Tick);
            timer1.Interval = 10000; // interval is in miliseconds .. current interval is for 10 sec
            timer1.Start();
        }

        void timer1_Tick(object sender, EventArgs e)
        {
            if (timer1.Interval == 10000) // once there window found still deactivated for perticular interval
            {
                timer1.Stop();
                this.Close();        // here you can log off the user & call the new window
            }
        }