private void button2_Click(object sender, EventArgs e) { if (addGood_Form == null) { addGood_Form = new AddGood_Form(this); addGood_Form.FormClosed += new FormClosedEventHandler(AddGood_Form_Closed); addGood_Form.Show(); } }
private void AddGood_Form_Closed(object sender, FormClosedEventArgs e) { addGood_Form = null; }