C#

static void Main(string[] args)
       {
           // Create a SpeechRecognitionEngine object for the default recognizer in the en-US locale.
           using (
           SpeechRecognitionEngine recognizer =
             new SpeechRecognitionEngine(
               new System.Globalization.CultureInfo("en-US")))
           {

               //// Create a grammar for finding services in different cities.
               //Choices services = new Choices(new string[] { "red", "green", "blue" });

               //GrammarBuilder findServices = new GrammarBuilder("Find");
               //findServices.Append(services);
               //// Create a Grammar object from the GrammarBuilder and load it to the recognizer.
               //Grammar servicesGrammar = new Grammar(findServices);
               //recognizer.LoadGrammarAsync(servicesGrammar);

               //GrammarBuilder startStop = new GrammarBuilder();
               //GrammarBuilder dictation = new GrammarBuilder();
               //dictation.AppendDictation();

               //startStop.Append(new SemanticResultKey("StartDictation", new SemanticResultValue("Begin", true)));
               //startStop.Append(new SemanticResultKey("DictationInput", dictation));
               //startStop.Append(new SemanticResultKey("StopDictation", new SemanticResultValue("Stop Dictation", false)));
               //Grammar grammar = new Grammar(startStop);
               //grammar.Enabled = true;
               //grammar.Name = " Free-Text Dictation ";
               //recognizer.LoadGrammarAsync(grammar);


               GrammarBuilder builder = new GrammarBuilder();
               //builder.Append("start");
               builder.AppendDictation("Start");
               //builder.Append("end");
               Grammar grammarWithDictation = new Grammar(builder);
               grammarWithDictation.Name = "Grammar with Dictation";
               recognizer.LoadGrammarAsync(grammarWithDictation);

               // Add a handler for the speech recognized event.
               recognizer.SpeechRecognized += new EventHandler<SpeechRecognizedEventArgs>(recognizer_SpeechRecognized);

               // Configure the input to the speech recognizer.
               recognizer.SetInputToDefaultAudioDevice();

               // Start asynchronous, continuous speech recognition.
               recognizer.RecognizeAsync(RecognizeMode.Multiple);

               // Keep the console window open.
               while (true)
               {
                   Console.ReadLine();
               }
           }

       }

       static void recognizer_SpeechRecognized(object sender, SpeechRecognizedEventArgs e)
       {
           Console.WriteLine("Recognized text: " + e.Result.Text);
       }