private void Calculate_Click(object sender, RoutedEventArgs e)
{
int a, b;
float fA, fB;
a = int.Parse(textBoxA.Text);
b = int.Parse(textBoxB.Text);
fA = float.Parse(textBoxfA.Text);
fB = float.Parse(textBoxfB.Text);
try
{
ClassLibrary1.Class1 externalDLL = new ClassLibrary1.Class1();
Substract.Sub substractDLL = new Substract.Sub();
textBoxCalc.Text = externalDLL.sum(a, b).ToString();
textBoxCalcSubstract.Text = substractDLL.substract(fA, fB).ToString();
}
catch (Exception ex)
{
MessageBox.Show(ex.ToString());
}
}