private void btnMcLaurinAna_Click(object sender, EventArgs e) { try { string v = tbxFormula.Text; if (rbtnPrefix.Checked) { if (v != "") { tabControl1.SelectedIndex = 0; treeLaurAn = treeLaurAn.CreateMcLaurinAn(v, (int)nudSeriesNumber.Value); lblFunction.Text = treeLaurAn.ReadMc(); this.draw.DrawMcLaurin(treeLaurAn); } else { MessageBox.Show("Please, write a valid formula!"); } } else { MessageBox.Show("Please, select the radio button!"); } } catch (MyException m) { MessageBox.Show(m.Message); } }