i have done speech to text code based on dictation grammar ,it is working fine ,recognizing my voice but what i pronounciate it types some other thing can anyone help me to make it recognize properly?

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.Recognition;

namespace speech2textt
{
    public partial class Form1 : Form
    {
        public Form1()
        {
             InitializeComponent();
        }


        SpeechRecognitionEngine Engine = new SpeechRecognitionEngine();
        DictationGrammar Grammar = new DictationGrammar();
    private void button1_Click(object sender, EventArgs e)
        {
            SpeechRecognitionEngine rec = new SpeechRecognitionEngine();

            rec.LoadGrammar(new Grammar(new GrammarBuilder("exit"))); // load grammar
            // rec.GrammarBuilder.Append(string);
            rec.LoadGrammar(new DictationGrammar());

            rec.SpeechRecognized += speech1;
            Engine.BabbleTimeout = TimeSpan.FromSeconds(10.0);
            Engine.EndSilenceTimeout = TimeSpan.FromSeconds(10.0);
            Engine.EndSilenceTimeoutAmbiguous = TimeSpan.FromSeconds(10.0);
            Engine.InitialSilenceTimeout = TimeSpan.FromSeconds(10.0);

            rec.SetInputToDefaultAudioDevice(); // set input to default audio device
            rec.RecognizeAsync(RecognizeMode.Multiple); // recognize speech

        }

    void speech1(object sender, SpeechRecognizedEventArgs e)
    {
        if (e.Result.Text == "exit")
        {
            Application.Exit();
        }
        else
        {
            richTextBox1.AppendText(" " +e.Result.Text);
        }

    }

    private void Form1_Load(object sender, EventArgs e)
    {

    }


    }
}