Application.EnableVisualStyles();
Application.SetCompatibleTextRenderingDefault(false);

ContextMenu menu = new ContextMenu(new []
	{
		new MenuItem("Show form"),
		new MenuItem("E&xit"),
	});
menu.MenuItems[0].Click += (sender, args) => { (new Form1()).Show(); };
menu.MenuItems[1].Click += (sender, args) => Application.Exit();

NotifyIcon ni = new NotifyIcon();
ni.Icon = Properties.Resources.Generic_Application;
ni.ContextMenu = menu;
ni.Text = "Demo app";
ni.Visible = true;

Application.Run();

ni.Visible = false;