//Show formulas:
private void button2_Click(object sender, System.EventArgs e)
{
this.textBox1.Text = calculator.GetFormula("A");
this.textBox2.Text = calculator.GetFormula("B");
this.textBox3.Text = calculator.GetFormula("C");
this.textBox4.Text = calculator.GetFormula("D");
}
private void butForm_Click(object sender, RoutedEventArgs e)
{
this.txtA.Text = calculator.GetFormula("A");
this.txtB.Text = calculator.GetFormula("B");
this.txtC.Text = calculator.GetFormula("C");
this.txtD.Text = calculator.GetFormula("D");
}