WPF Speech SpeechSynthesizer

Add reference System.Speech

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Speech.Synthesis;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Interop;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;

namespace WpfApp127
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
            this.Loaded += MainWindow_Loaded;
        }

        private void MainWindow_Loaded(object sender, RoutedEventArgs e)
        {
            SpeechDemo();
        }

        int idx = 0;
        private void SpeechDemo()
        {
            SpeechSynthesizer synth = new SpeechSynthesizer();
            synth.SelectVoiceByHints(VoiceGender.Female, VoiceAge.Child);
            var voices = synth.GetInstalledVoices();
            foreach (var voice in voices)
            {
                Console.WriteLine(voice.VoiceInfo.Name);
            }
            synth.SelectVoice("Microsoft Zira Desktop");

            while (true)
            {
                string msg = $"{++idx},{Guid.NewGuid().ToString("N").Substring(0, 5)}";
                //synth.SetOutputToWaveFile("SpeechSynchesizer2.wav");

                synth.Speak(msg);
            }
        }
    }
}