protected void btnCalcular_Click(object sender, EventArgs e) { try { double radio = Convert.ToDouble(txtRadio.Text); double altura = Convert.ToDouble(txtAltura.Text); WebService1 webService = new WebService1(); txtArea.Text = webService.Cilindro(radio, altura).ToString(); webService = null; return; } catch (Exception error) { labelMsg.Text = error.Message; return; } }