/// <summary>
 /// Updates the URL text control based on the values in this form's controls.
 /// </summary>
 private void UpdateUrlText()
 {
     try
     {
         txtUrl.Text = _requestService.BuildUrl(txtHost.Text, cmbApiVersion.Text,
                                                (int)cmbEndpoint.SelectedValue, txtApiKey.Text, chkUseSsl.Checked);
     }
     catch (Exception ex)
     {
         MessageBox.Show(ex.Message);
     }
 }