AzureIoTHubConnectedService.DeviceSelectionDialog.okButton_Click C# (CSharp) Method

        private void okButton_Click(object sender, RoutedEventArgs e)
        {
            if (listBox.SelectedItem != null)
            {
                this.SelectedDeviceID = this.listBox.SelectedItem.ToString();
                this.DialogResult = true;
            }
            else
            {
                this.DialogResult = false;
            }
            this.Close();
        }
        private async void newButton_Click(object sender, RoutedEventArgs e)