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// this variable goes in the main scope of your class
NotifyIcon TrayIcon = new NotifyIcon(); // create the icon to show in the tray

// put this in the constructor for your form
this.TrayIcon.Icon = new Icon(".\\icon.ico"); // apply an icon to it
this.TrayIcon.Visible = false; // make sure it isn't displaying by default
this.Resize += new EventHandler(Form_Resize); // add a resize event
this.TrayIcon.MouseDoubleClick += new MouseEventHandler(TrayIcon_MouseDoubleClick);

// then put these 2 methods in your class
void Form_Resize(object sender, EventArgs e)
{
    if (this.WindowState == FormWindowState.Minimized)
    { // if the form has been minimised
        this.Hide(); // hide the form
        this.TrayIcon.Visible = true; // display the tray icon
    }
}

void TrayIcon_MouseDoubleClick(object sender, MouseEventArgs e)
{
    this.TrayIcon.Visible = false; // hide the tray icon
    this.Show(); // display the window
    this.WindowState = FormWindowState.Normal; // reset the form state from minimised
}

/** EXAMPLE USAGE **/
using System;
using System.Drawing;
using System.Windows.Forms;

namespace DIC
{
    public partial class MainForm : Form
    {
        // this variable goes in the main scope of your class
        NotifyIcon TrayIcon = new NotifyIcon(); // create the icon to show in the tray
        public MainForm()
        {
            InitializeComponent();
            this.Icon = new Icon(".\\icon.ico");
            
            // put this in the constructor for your form
            this.TrayIcon.Icon = new Icon(".\\icon.ico"); // apply an icon to it
            this.TrayIcon.Visible = false; // make sure it isn't displaying by default
            this.Resize += new EventHandler(Form_Resize); // add a resize event
            this.TrayIcon.MouseDoubleClick += new MouseEventHandler(TrayIcon_MouseDoubleClick);
        }

        void Form_Resize(object sender, EventArgs e)
        {
            if (this.WindowState == FormWindowState.Minimized)
            { // if the form has been minimised
                this.Hide(); // hide the form
                this.TrayIcon.Visible = true; // display the tray icon
            }
        }
        
        void TrayIcon_MouseDoubleClick(object sender, MouseEventArgs e)
        {
            this.TrayIcon.Visible = false; // hide the tray icon
            this.Show(); // display the window
            this.WindowState = FormWindowState.Normal; // reset the form state from minimised
        }
    }
}