BrowserSelect.frm_settings.button1_Click C# (CSharp) Метод

        private void button1_Click(object sender, EventArgs e)
        {
            if (_frmHelp != null)
            {   //help window is open
                _frmHelp.Focus();
            }
            else
            {   //its not open...
                _frmHelp = new frm_help_rules();
                _frmHelp.FormClosed += (o, ev) => _frmHelp = null;
                _frmHelp.Show();
            }
        }