パレットアイコン

 public partial class Form4 : Form
    {
        private NotifyIcon notifyIcon = null;//       
        private ContextMenu contextMenu = null;
        private MenuItem menuItem1;
        private MenuItem menuItem2;
        public Form4()
        {
            InitializeComponent();
            if (notifyIcon == null)
            {
                notifyIcon = new NotifyIcon();
            }
            notifyIcon.Icon = new Icon("es.ico");
            menuItem1 = new MenuItem(" ");
            menuItem2 = new MenuItem(" ");
            menuItem1.Click += new EventHandler(menuItem1_Click);
            menuItem2.Click += new EventHandler(menuItem2_Click);
            contextMenu = new ContextMenu();
            contextMenu.MenuItems.Add(menuItem1);
            contextMenu.MenuItems.Add(menuItem2);
            notifyIcon.ContextMenu = contextMenu;
            notifyIcon.Text = " ";
            notifyIcon.DoubleClick += new EventHandler(notifyIcon_DoubleClick);      
        }
        private void menuItem1_Click(object sender, EventArgs e)
        {
            if (this.WindowState == FormWindowState.Minimized)
            {
                this.Show();
                this.WindowState = FormWindowState.Normal; //  
            }
        }
        private void menuItem2_Click(object sender, EventArgs e)
        {
            Application.Exit();
            notifyIcon.Dispose();
        }
        private void notifyIcon_DoubleClick(object sender, EventArgs e)
        {

            if (this.WindowState == FormWindowState.Minimized)
            {
                this.Show();
                this.WindowState = FormWindowState.Normal; //  
            }
        }
        private void Form4_Load(object sender, EventArgs e)
        {
   
        }
        private void Form4_SizeChanged(object sender, EventArgs e)
        {
            if (this.WindowState == FormWindowState.Normal)
            {
                notifyIcon.Visible = false; // 
            }
            if (this.WindowState == FormWindowState.Minimized)// 
            {
                this.Hide();// 
                notifyIcon.Visible = true;
            }
        }

        private void Form4_FormClosing(object sender, FormClosingEventArgs e)
        {
            Application.Exit();
            notifyIcon.Dispose();
        }
    }