Как сделать активным приложение при выходе из трея C#

        private void notifyIcon1_MouseDoubleClick(object sender, MouseEventArgs e)
        { 
            Opacity = 1; 
            ShowInTaskbar = true; 
            notifyIcon1.Visible = false; 
            this.Focus();
        }
    }

this.WindowState = FormWindowState.Normal;

private void Form1_Resize(object sender, EventArgs e)
{
    if (this.WindowState == FormWindowState.Minimized) {
        notifyIcon1.Visible = true;
        this.Hide();
    }
}
 
private void notifyIcon1_MouseDoubleClick(object sender, MouseEventArgs e)
{
    this.Show();
    this.WindowState = FormWindowState.Normal;
    notifyIcon1.Visible = false;
}

      private void button1_Click(object sender, EventArgs e)
        {
            Opacity = 0.0; ShowInTaskbar = false;
            notifyIcon1.Visible = true;
 
        }
        private void notifyIcon1_MouseDoubleClick(object sender, MouseEventArgs e)
        {
            Opacity = 1; ShowInTaskbar = true;
            this.Show();
            this.WindowState = FormWindowState.Normal;
            notifyIcon1.Visible = false;
        }
        private void Form1_Resize(object sender, EventArgs e)
        {
            if (this.WindowState == FormWindowState.Minimized)
            {
                notifyIcon1.Visible = true;
                this.Hide();
            }
        }
    }
}