Как конвертировать речь (файл.wav) в текстовый файл?

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Как я могу конвертировать речь (записанный файл .wav) в текстовый файл. Я написал код C#, как показано ниже. Пожалуйста, проверьте и скажите мне, все ли правильно или нет. Я запустил этот код и получаю сообщение об ошибке.

using System;
using System.IO;
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;
using System.Speech.AudioFormat;

namespace reco
{
    public partial class Form1 : Form
    {
        private SpeechRecognitionEngine recognitionEngine;

        public Form1()
        {
            InitializeComponent();
            try
            {
               
                recognitionEngine = new SpeechRecognitionEngine();
                DictationGrammar dg = new DictationGrammar();
                recognitionEngine.LoadGrammar(dg);
                recognitionEngine.SetInputToDefaultAudioDevice();

                recognitionEngine.SetInputToWaveFile(@"C:\Users\Deep\Music\New folder\mp3.wav");
                recognitionEngine.EndSilenceTimeout = new TimeSpan(0, 0, 2);
                recognitionEngine.Recognize();
                recognitionEngine.RecognizeAsync();
                recognitionEngine.SpeechHypothesized += new EventHandler<speechhypothesizedeventargs>(reco_SpeechHypothesized);
                recognitionEngine.SpeechRecognized += new EventHandler<speechrecognizedeventargs>(reco_SpeechRecognized);
                recognitionEngine.RecognizeCompleted += new EventHandler<recognizecompletedeventargs>(reco_RecognizeCompleted);
                recognitionEngine.AudioSignalProblemOccurred += new EventHandler<audiosignalproblemoccurredeventargs>(reco_AudioSignalProblemOccurred);
                recognitionEngine.SpeechDetected += new EventHandler<speechdetectedeventargs>(reco_SpeechDetected);
                recognitionEngine.SpeechRecognitionRejected += new EventHandler<speechrecognitionrejectedeventargs>(reco_SpeechRecognitionRejected);

                recognitionEngine.RecognizeAsync(RecognizeMode.Multiple);
            }
            catch (Exception e)
            {
                MessageBox.Show("the Error"+e);
            }
        }
        private void Form1_Load(object sender, EventArgs e)
        {

        }
        void reco_AudioSignalProblemOccurred(object sender, AudioSignalProblemOccurredEventArgs e)
        {
            richTextBox1.AppendText(e.AudioSignalProblem.ToString());
        }

        void reco_SpeechHypothesized(object sender, SpeechHypothesizedEventArgs e)
        {
            richTextBox1.AppendText(e.Result.Text);
        }

        void reco_SpeechRecognitionRejected(object sender, SpeechRecognitionRejectedEventArgs e)
        {
            richTextBox1.AppendText("Rejected!");
        }

        void reco_RecognizeCompleted(object sender, RecognizeCompletedEventArgs e)
        {
            richTextBox1.AppendText("Recognition Complete!");
        }

        void reco_SpeechRecognized(object sender, SpeechRecognizedEventArgs e)
        {
            richTextBox1.AppendText(e.Result.Text);
        }

        void reco_SpeechDetected(object sender, SpeechDetectedEventArgs e)
        {
            richTextBox1.AppendText("Speech Detected!");
        }

     
      
         
        }
    }</speechrecognitionrejectedeventargs></speechdetectedeventargs></audiosignalproblemoccurredeventargs></recognizecompletedeventargs></speechrecognizedeventargs></speechhypothesizedeventargs>

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