how can make speech recognition application in C#

Question

i want to make speech recognition application using C# and window vista

below is my code

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Linq;

using System.Text;

using System.Windows.Forms;

using System.Speech;

using System.Speech.Synthesis;

using System.Speech.Recognition;

using System.Threading.Tasks;

using System.Diagnostics;

using System.Speech.AudioFormat;

using System.Globalization;

namespace proposed_embed_system

{

public partial class Form5 : Form

{

SpeechSynthesizer ss = new SpeechSynthesizer();

// PromptBuilder pb = new PromptBuilder();

SpeechRecognitionEngine sre = new SpeechRecognitionEngine();

Choices clist = new Choices();

public Form5()

{

clist.Add(new string[] { "hello", " johan ", "kate" });

Grammar gr = new Grammar(new GrammarBuilder(clist));

try

{

sre.RequestRecognizerUpdate();

sre.LoadGrammar(gr);

sre.SpeechRecognized += sre_SpeechRecognized;

sre.SetInputToDefaultAudioDevice();

sre.RecognizeAsync(RecognizeMode.Multiple);

}

catch(Exception ex)

{

MessageBox.Show(ex.Message.ToString());

return; }

ss.SelectVoiceByHints(VoiceGender.Female);

ss.Speak("Well Come to Voice mode Transaction");

InitializeComponent();

}

public void say(string h)

{

ss.Speak(h);

}

void sre_SpeechRecognized(object sender, SpeechRecognizedEventArgs e)

{

string r = e.Result.Text;

if (r == "hello")

{

say("hi");

}

if (r == " johan")

{

say("ok what is your mother name");

}

if (r == "kate")

{

say("please select transaction type");

}

}

}

}

when run show error

 The language for the grammar does not match the language of the speech recognizer.

Please help where i wrong with these codes