Remove Notifyicon from system tray

I used NotifyIcon in one application and it's running. The icon showing in system tray. When i close my application directly, the NotifyIcon also not visible. Because i called NotifyIcon.Dispose() method in form_Closed method. But I close my application through external application. That is find the Process and kill that process. So my application was closed, but NotifyIcon is not removed from system tray. Previously i used ProcessName.Kill(), now it's changed to

ProcessName.CloseMainWindow()

Then close the my application and NotifyIcon from system tray also.