private void button2_Click(object sender, EventArgs e) { int num1 = Convert.ToInt32(textBox1.Text); int num2 = Convert.ToInt32(textBox3.Text); int den1 = Convert.ToInt32(textBox2.Text); int den2 = Convert.ToInt32(textBox4.Text); Fraction f5 = new Fraction(num1, den1); Fraction f6 = new Fraction(num2, den2); Fraction ris = f5.Sub(f6); label10.Text = ris.Extractnumerator().ToString(); label11.Text = ris.Extractdenominator().ToString(); }