private void btnDivision_Click(object sender, EventArgs e)
        {
            clsCalculos calculos = new clsCalculos();

            try
            {
                if (ValidacionCampoOK1("Division"))
                {
                    textBox3.Text = calculos.Dividir(Convert.ToDouble(textBox1.Text), Convert.ToDouble(textBox2.Text)).ToString();
                }
            }
            catch (Exception er)
            {
                MessageBox.Show("Erroor: " + er.Message);
            }
        }
        private void btnRestar_Click(object sender, EventArgs e)
        {
            clsCalculos calculos = new clsCalculos();

            try
            {
                if (ValidacionCampoOK1("Restar"))
                {
                    //valor1 = Convert.ToDouble(textBox1.Text);
                    //valor2 = Convert.ToDouble(textBox2.Text);
                    //textBox3.Text = calculos.resta(valor1, valor2).ToString();

                    textBox3.Text = calculos.resta(Convert.ToDouble(textBox1.Text), Convert.ToDouble(textBox2.Text)).ToString();
                }
            }
            catch (Exception er)
            {
                MessageBox.Show("Erroor: " + er.Message);
            }
        }
    protected void btnCalcular_Click(object sender, EventArgs e)
    {
        //  clsCalculos calculos = new clsCalculos(0, 0, 0);

        clsCalculos calculos = new clsCalculos();


        if (rbOperacion.SelectedValue == "1")
        {
            txtResultado.Text = calculos.Suma(Convert.ToDouble(txt1.Text), Convert.ToDouble(txt2.Text)) + "";
        }
        else if (rbOperacion.SelectedValue == "2")
        {
            txtResultado.Text = calculos.Resta(Convert.ToDouble(txt1.Text), Convert.ToDouble(txt2.Text)) + "";
        }
        else if (rbOperacion.SelectedValue == "3")
        {
            txtResultado.Text = calculos.Producto(Convert.ToDouble(txt1.Text), Convert.ToDouble(txt2.Text)) + "";
        }
    }