Making system tray icon for your application using c# is very easy.
Copy the following code in your form loading event.
private NotifyIcon appIcon = new NotifyIcon();
Icon ico = new Icon("icon.ico");
appIcon.Icon = ico;
appIcon.Text = "Vinoth Application";
appIcon.Visible = true;
put your icon file in your bin->Debug folder.
then run the application ...that's all.