Form als Tray Icon ablegen (Notifyicon)

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// das notifyIcon1 kann am einfachsten per Designer erstellt werden

private void notifyIcon1_Click_1(object sender, System.EventArgs e)
{     
  this.ShowInTaskbar = true;
  this.notifyIcon1.Visible = false;
  this.WindowState = FormWindowState.Normal;
}

private void Form1_Resize(object sender, System.EventArgs e)
{
  if (this.WindowState == FormWindowState.Minimized)
  {
    this.notifyIcon1.ContextMenu = contextMenu1;
    this.ShowInTaskbar = false;
    this.WindowState = FormWindowState.Minimized;
    this.notifyIcon1.Visible = true;
  }
}