System.Speech vs Microsoft.Speech

Ref: https://www.wpf-tutorial.com/audio-video/speech-recognition-making-wpf-listen/
        Kinect SDK 1.8 SpeechBasic-WPF
1-1. ASUS X450J @ Windows 10 x64 Edu
1-2. Kinect SDK 1.8
1-3. Visual Studio 2017

2 Ex from https://www.wpf-tutorial.com/audio-video/speech-recognition-making-wpf-listen/
2-1 New WPF Project
2-2 Add System.Speech.DLL
2-3 using System.Speech.Recognition;
2-4
SpeechRecognitionEngine speechRecognizer = new SpeechRecognitionEngine();
        public MainWindow()
        {
            InitializeComponent();
            speechRecognizer.SpeechRecognized += SpeechRecognizer_SpeechRecognized;

            GrammarBuilder grammarBuilder = new GrammarBuilder();
            Choices commandChoices = new Choices("weight", "color", "size", "顏色");
            grammarBuilder.Append(commandChoices);

            Choices valueChoices = new Choices();
            valueChoices.Add("normal", "bold");
            valueChoices.Add("red", "green", "blue");
            valueChoices.Add("small", "medium", "large");
            valueChoices.Add("紅色", "黑色", "白色");
            grammarBuilder.Append(valueChoices);

            speechRecognizer.LoadGrammar(new Grammar(grammarBuilder));
            speechRecognizer.SetInputToDefaultAudioDevice();
            speechRecognizer.RecognizeAsync(RecognizeMode.Multiple);
        }
    private void SpeechRecognizer_SpeechRecognized(object sender, SpeechRecognizedEventArgs e)
        {
            this.Content = e.Result.Text;
            //string command = e.Result.Words[0].Text.ToLower();
            //string value = e.Result.Words[1].Text.ToLower();
          }

        private void Window_Closing(object sender, System.ComponentModel.CancelEventArgs e)
        {
            speechRecognizer.RecognizeAsyncStop();
            speechRecognizer.Dispose();
        }

3. Ref : SpeechBasic-WPF and ex2 Notes: The default CultureInfo is zh-TW
     @ Microsoft.Speech ==> without zh-TW.
3-1 Add Ref
C:\WINDOWS\assembly\GAC_MSIL\Microsoft.Speech\11.0.0.0__31bf3856ad364e35\Microsoft.Speech.dll
3-2 using Microsoft.Speech.Recognition;
3-3
public partial class MainWindow : Window
    {
        SpeechRecognitionEngine speechRecognizer = new SpeechRecognitionEngine(new System.Globalization.CultureInfo("en-US"));
        public MainWindow()
        {
            InitializeComponent();
            speechRecognizer.SpeechRecognized += SpeechRecognizer_SpeechRecognized;

            GrammarBuilder grammarBuilder = new GrammarBuilder();
            grammarBuilder.Culture = new System.Globalization.CultureInfo("en-US"); 
           // System.Threading.Thread.CurrentThread.CurrentCulture;
            Choices commandChoices = new Choices("weight", "color", "size");
            grammarBuilder.Append(commandChoices);

            Choices valueChoices = new Choices();
            valueChoices.Add("normal", "bold");
            valueChoices.Add("red", "green", "blue");
            valueChoices.Add("small", "medium", "large");
            //valueChoices.Add("紅色", "黑色", "白色");
            grammarBuilder.Append(valueChoices);

            speechRecognizer.LoadGrammar(new Grammar(grammarBuilder));
            speechRecognizer.SetInputToDefaultAudioDevice();
            speechRecognizer.RecognizeAsync(RecognizeMode.Multiple);
        }
   
    private void SpeechRecognizer_SpeechRecognized(object sender, SpeechRecognizedEventArgs e)
        {
            this.Content = e.Result.Text;
            string command = e.Result.Words[0].Text.ToLower();
            string value = e.Result.Words[1].Text.ToLower();
        }

        private void Window_Closing(object sender, System.ComponentModel.CancelEventArgs e)
        {
            speechRecognizer.RecognizeAsyncStop();
            speechRecognizer.Dispose();
        }