How to minimize and maximize windows form with system tray (notifyIcon control).

I'm having a problem with the notifyIcon control, which hasn't been able to minimize and maximize my application when double clicked. You could please review the code I'm using below... private void notifyIcon1_DoubleClick(object sender, System.EventArgs e) { if ((this.WindowState == FormWindowState.Minimized)||(this.WindowState == FormWindowState.Normal)) this.WindowState = FormWindowState.Minimized; // Activate the form. this.Activate(); }