private void BtnEquals_Click(object sender, RoutedEventArgs e)
{
double newNumber;
if (double.TryParse(lblResult.Content.ToString(), out newNumber))
{
switch (selectedOperator)
{
case SelectedOperator.Addition:
result = SimpleMath.Add(lastNumber, newNumber);
break;
case SelectedOperator.Subtraction:
result = SimpleMath.Minus(lastNumber, newNumber);
break;
case SelectedOperator.Multiplication:
result = SimpleMath.Times(lastNumber, newNumber);
break;
case SelectedOperator.Division:
result = SimpleMath.Divide(lastNumber, newNumber);
break;
}
}
lblResult.Content = result.ToString();
}