private void button2_Click(object sender, EventArgs e)

{

    textBox2.Text += div(, , ).ToString() + " | ";

    textBox2.Text += div(, ).ToString();

}

private double div(double value1, double value2, int digits=)

{

    if (value2 == 0.0)

    {

        return ;

    }

    Decimal dm1 = new Decimal(value1);

    Decimal dm2 = new Decimal(value2);

    decimal fdsd = Decimal.Divide(dm1, dm2);

    double dret = Convert.ToDouble(fdsd);

    if (digits != )

    {

        dret = Math.Round(dret, digits);

    }

    return dret;

}