private void btnCalcular2_Click(object sender, EventArgs e)
{
Somar s2;
s2 = new Somar(int.Parse(txtN1.Text), int.Parse(txtN2.Text));
s2.calcular();
lblResultado.Text = s2.getResultado().ToString();
}
public frmSomar()
{
InitializeComponent();
s1 = new Somar();
}