Speak

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

namespace DefaultInput
{
    class Program
    {
        // Indicate whether asynchronous recognition has finished.
        static bool completed;

        static void Main(string[] args)
        {
            using (SpeechRecognitionEngine recognizer = new SpeechRecognitionEngine(new CultureInfo("en-US")))
            {

                // Create and load the exit grammar.
                Grammar exitGrammar = new Grammar(new GrammarBuilder("exit"));
                exitGrammar.Name = "Exit Grammar";
                recognizer.LoadGrammar(exitGrammar);

                // Create and load the dictation grammar.
                Grammar dictation = new DictationGrammar();
                dictation.Name = "Dictation Grammar";
                recognizer.LoadGrammar(dictation);

                // Attach event handlers to the recognizer.
                recognizer.SpeechRecognized += new EventHandler<SpeechRecognizedEventArgs>(SpeechRecognizedHandler);
                recognizer.RecognizeCompleted += new EventHandler<RecognizeCompletedEventArgs>(RecognizeCompletedHandler);

                // Assign input to the recognizer.
                recognizer.SetInputToDefaultAudioDevice();

                // Begin asynchronous recognition.
                Console.WriteLine("Starting recognition...");
                completed = false;
                recognizer.RecognizeAsync(RecognizeMode.Multiple);

                // Wait for recognition to finish.
                while (!completed)
                {
                    Thread.Sleep(333);
                }
                Console.WriteLine("Done.");
            }

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

        static void SpeechRecognizedHandler(object sender, SpeechRecognizedEventArgs e)
        {
            Console.WriteLine("  Speech recognized:");
            string grammarName = "<not available>";
            if (e.Result.Grammar.Name != null && !e.Result.Grammar.Name.Equals(string.Empty))
            {
                grammarName = e.Result.Grammar.Name;
            }
            Console.WriteLine("    {0,-17} - {1}", grammarName, e.Result.Text);

            if (grammarName.Equals("Exit Grammar"))
            {
                ((SpeechRecognitionEngine)sender).RecognizeAsyncCancel();
            }
        }

        static void RecognizeCompletedHandler(object sender, RecognizeCompletedEventArgs e)
        {
            Console.WriteLine("  Recognition completed.");
            completed = true;
        }
    }
}