private void btnCompute_Click(object sender, EventArgs e) { CalScore calsScore = null; int correct = Convert.ToInt32(txtCorrectAnswer.Text); int incorrect = Convert.ToInt32(txtIncorrectAnswer.Text); if (rdobtnAdult.Checked) { calsScore = new CalScore(Scorer.AdultScore); } if (rdobtnChild.Checked) { calsScore = new CalScore(Scorer.ChildScore); } lblScore.Text = calsScore(correct, incorrect).ToString(); }