C# System.Speech

using System;
using System.Speech.Recognition;
using System.Threading;

namespace SharedRecognizer
{
  class Program
  {

    // Indicate whether the asynchronous emulate recognition
    // operation has completed.
    static bool completed;

    static void Main(string[] args)
    {

      // Initialize an instance of the shared recognizer.
      using (SpeechRecognizer recognizer = new SpeechRecognizer())
      {

        // Create and load a sample grammar.
        Grammar testGrammar =
          new Grammar(new GrammarBuilder("testing testing"));
        testGrammar.Name = "Test Grammar";
        recognizer.LoadGrammar(testGrammar);

        // Attach event handlers for recognition events.
        recognizer.SpeechRecognized +=
          new EventHandler<SpeechRecognizedEventArgs>(
            SpeechRecognizedHandler);
        recognizer.EmulateRecognizeCompleted +=
          new EventHandler<EmulateRecognizeCompletedEventArgs>(
            EmulateRecognizeCompletedHandler);

        completed = false;

        // Start asynchronous emulated recognition. 
        // This matches the grammar and generates a SpeechRecognized event.
        recognizer.EmulateRecognizeAsync("testing testing");

        // Wait for the asynchronous operation to complete.
        while (!completed)
        {
          Thread.Sleep(333);
        }

        completed = false;

        // Start asynchronous emulated recognition.
        // This does not match the grammar or generate a SpeechRecognized event.
        recognizer.EmulateRecognizeAsync("testing one two three");

        // Wait for the asynchronous operation to complete.
        while (!completed)
        {
          Thread.Sleep(333);
        }
      }

      Console.WriteLine();
      Console.WriteLine("Press any key to exit...");
      Console.ReadKey();
    }

    // Handle the SpeechRecognized event.
    static void SpeechRecognizedHandler(
      object sender, SpeechRecognizedEventArgs e)
    {
      if (e.Result != null)
      {
        Console.WriteLine("Recognition result = {0}",
          e.Result.Text ?? "<no text>");
      }
      else
      {
        Console.WriteLine("No recognition result");
      }
    }

    // Handle the SpeechRecognizeCompleted event.
    static void EmulateRecognizeCompletedHandler(
      object sender, EmulateRecognizeCompletedEventArgs e)
    {
      if (e.Result == null)
      {
        Console.WriteLine("No result generated.");
      }

      // Indicate the asynchronous operation is complete.
      completed = true;
    }
  }
}