WinForms tray app boilerplate. Full credit to https://alanbondo.wordpress.com/2008/06/22/creating-a-system-tray-app-with-c/

program.cs

using System;
using System.Drawing;
using System.Windows.Forms;

/// WinForms trap app boilerplate
/// Full credit to @alanbondo:
/// https://alanbondo.wordpress.com/2008/06/22/creating-a-system-tray-app-with-c/
namespace TrayApp
{
    public class App : Form
    {
        [STAThread]
        public static void Main()
        {
            Application.Run(new App());
        }
 
        private NotifyIcon _trayIcon;
        private ContextMenu _trayMenu;
 
        public App()
        {
            _trayMenu = new ContextMenu();
            _trayMenu.MenuItems.Add("Exit", OnExit);
 
            _trayIcon = new NotifyIcon
            {
                Text = "MyTrayApp",
                Icon = new Icon(SystemIcons.Application, 40, 40),
                ContextMenu = _trayMenu,
                Visible = true,
            };
            
            // TODO: launch your background worker here
        }
 
        protected override void OnLoad(EventArgs e)
        {
            Visible = false;
            ShowInTaskbar = false;
            
            base.OnLoad(e);
        }
 
        private void OnExit(object sender, EventArgs e)
        {
            Application.Exit();
        }
 
        protected override void Dispose(bool isDisposing)
        {
            if (isDisposing)
                _trayIcon.Dispose();
            
            base.Dispose(isDisposing);
        }
    }
}