minimize app to system tray

• C# System Tray Minimize To Tray With NotifyIcon
• Minimize window to system tray

Handle the form’s Resize event. In this handler, you override the
basic functionality of the Resize event to make the form minimize to
the system tray and not to the taskbar. This can be done by doing the
following in your form’s Resize event handler: Check whether the
form’s WindowState property is set to FormWindowState.Minimized. If
yes, hide your form, enable the NotifyIcon object, and show the
balloon tip that shows some information. Once the WindowState becomes
FormWindowState.Normal, disable the NotifyIcon object by setting its
Visible property to false. Now, you want the window to reappear when
you double click on the NotifyIcon object in the taskbar. For this,
handle the NotifyIcon’s MouseDoubleClick event. Here, you show the
form using the Show() method.

private void frmMain_Resize(object sender, EventArgs e)
{
    if (FormWindowState.Minimized == this.WindowState)
    {
       mynotifyicon.Visible = true;
       mynotifyicon.ShowBalloonTip(500);
       this.Hide();
    }

    else if (FormWindowState.Normal == this.WindowState)
    {
       mynotifyicon.Visible = false;
    }
}