Listing B

using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;

namespace HelloWorld
{
    public sealed partial class MainPage : Page
    {
        public MainPage()
        {
            this.InitializeComponent();
        }

        private async void Button_Click(object sender, RoutedEventArgs e)
        {
            MediaElement mediaElement = new MediaElement();
            var synth = new
                    Windows.Media.Speech.Synthesis.SpeechSynthesizer();
                Windows.Media.SpeechSynthesis.SpeechSynthesisStream
                    stream = await synth.Synthesize.SynthesizeTextToStreamAsync("Hello, World");
                mediaElement.SetSource(stream, stream.ContentType);
                mediaElement.Play();
        }
    }
}