GettingSettingHTMLMainWindow.xaml.cs

public partial class MainWindow : Window
{
    public MainWindow()
    {
        InitializeComponent();
    }

    private void BrowserView_OnFrameLoadEnd(object sender, FrameLoadEndEventArgs e)
    {
        //Please note that the delegate is marked as ‘async’
        Dispatcher.BeginInvoke((Action) (async () =>
        {
            //Here we asynchronously get the HTML content of the browser
            HtmlTextBox.Text = await BrowserView.GetSourceAsync();
        }));
    }

    private void SetHtmlButton_OnClick(object sender, RoutedEventArgs e)
    {
        //Synchronously set the HTML content of the browser
        BrowserView.LoadHtml(HtmlTextBox.Text);
    }
}