private void butDelete_Click(object sender, EventArgs e) { if (!AllergyDefCur.IsNew) { if (!AllergyDefs.DefIsInUse(AllergyDefCur.AllergyDefNum)) { AllergyDefs.Delete(AllergyDefCur.AllergyDefNum); } else { MsgBox.Show(this, "Cannot delete allergies in use."); return; } } DialogResult = DialogResult.Cancel; }