How To Mute "DING" Sound When User Click Outside Form?

Question

I'm showing a form using Form.ShowDialog(), in this Form I have override void WndProc(ref Message m) because I want to close this form when user click outside Form area.

    private const int WM_NCACTIVATE = 0x0086;
    protected override void WndProc(ref Message m)
    {
        switch (m.Msg)
        {
            case WM_NCACTIVATE:
                if (_canClose) // when user click outside form, close form
                    this.Close(this, EventArgs.Empty);
                break;
            default:
                break;
        }

        base.WndProc(ref m);
    }

This code work as I expected, but one minor problem, Windows play DING sound every time user click outside Form area, I want to "mute" this DING when this code processed.

UPDATE

I managed to make this Form work as I want to, using advice from Hassan Mujtaba, but I still wonder how to mute this DING if I use Form.ShowDialog.

Answer 1

Using Form.Show() instead of Form.ShowDialog() will solve the problem.