Wrong recognition using sapi

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C#

hi ,
I developed an application which converts wav file to text using c#. Using SAPI TTS app tool i saved the wav file in microsoft voice itself. For accurate recognition only i saved it in microsoft voice. Though the result is not accurate. It is recognizing the words wrongly, such as meeting as needing and cute as dubed etc.
I attached my code with it.

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.IO;
using SpeechLib;
namespace using_wav
{
    public partial class Form1 : Form
    {
        private SpeechLib.ISpeechRecoContext wavRecoContext = null;
        private SpeechLib.SpFileStream InputWAV = null;
        private SpeechLib.ISpeechRecoGrammar Grammar = null;
        private String _WAVFile = null;
        private string strData = "No recording yet";
        private String _lastRecognized = "";

        public Form1()
        {
            InitializeComponent();
        }
        private void button2_Click(object sender, EventArgs e)
        {
           Close();
        }
        private void button1_Click(object sender, EventArgs e)
        {
           //String[] filePaths = Directory.GetFiles(@"c:\MyDir\", "*.bmp",
           //                              SearchOption.AllDirectories);
            OpenFileDialog dialog = new OpenFileDialog();
            dialog.Title =
            "Select a Speech file";
            dialog.ShowDialog();
            _WAVFile = dialog.FileName;
           //_WAVFile = dialog.filePaths;
            if (_WAVFile == null) return;
            wavRecoContext =new SpeechLib.SpInProcRecoContext();
            ((SpInProcRecoContext)wavRecoContext).Recognition +=new _ISpeechRecoContextEvents_RecognitionEventHandler(wavRecoContext_Recognition);
            ((SpInProcRecoContext)wavRecoContext).EndStream += new _ISpeechRecoContextEvents_EndStreamEventHandler(wavRecoContext_EndStream);
            Grammar = wavRecoContext.CreateGrammar(2);
            Grammar.DictationLoad("", SpeechLoadOption.SLOStatic);
            InputWAV = new SpFileStream();
            InputWAV.Open(@_WAVFile,SpeechStreamFileMode.SSFMOpenForRead, false);
            wavRecoContext.Recognizer.AudioInputStream = InputWAV;
            Grammar.DictationSetState(SpeechRuleState.SGDSActive);
            }
        private void wavRecoContext_Recognition(int StreamNumber, object StreamPosition, SpeechRecognitionType RecognitionType, ISpeechRecoResult Result)
        {
            strData = Result.PhraseInfo.GetText(0, -1,true);
            _lastRecognized = textBox1.Text;
            textBox1.Text = strData;
        }
        private void wavRecoContext_EndStream(int StreamNumber, object StreamPosition, bool f)
        {
            Grammar.DictationSetState(
            SpeechRuleState.SGDSInactive); 
        }
    }
}

Is there any fault in this code.
Thanks in advance.

[edit]Code block added - OriginalGriff[/edit]