Recording Sound Using Direct Sound !

Question

Hi , What is gonna wrong in this 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 Microsoft.DirectX;
using Microsoft.DirectX.DirectSound;
using System.IO;
using Buffer = Microsoft.DirectX.DirectSound.SecondaryBuffer;
namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        CaptureBuffer captureBuffer;
        CaptureBufferDescription captureDes = new CaptureBufferDescription();
        WaveFormat waveFormat = new WaveFormat();
        Capture captureDevice = new Capture();
        Device sndDevice;
        SecondaryBuffer buffer;
        StreamWriter wStream;
        StreamReader wReader;
        char[] bytes;
        char[] bytesRead;
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {


            captureDes.BufferBytes = 192000;
            waveFormat.BitsPerSample = 8;
            waveFormat.Channels = 1;
            waveFormat.SamplesPerSecond = 22050;
            waveFormat.BlockAlign = (short)(waveFormat.Channels * (waveFormat.BitsPerSample/8));
            waveFormat.AverageBytesPerSecond = waveFormat.BlockAlign * waveFormat.SamplesPerSecond;
            captureDes.Format = waveFormat;
            waveFormat.BlockAlign = 1;
            captureDes.Format = waveFormat;
            captureDes.BufferBytes = 100000;
            captureDes.ControlEffects = false;
            captureDes.WaveMapped = true;
            captureBuffer = new Microsoft.DirectX.DirectSound.CaptureBuffer(captureDes, captureDevice);
            bytes = new char[100000];
            bytesRead = new char[100000];
            sndDevice = new Device();
            sndDevice.SetCooperativeLevel(this, CooperativeLevel.Normal);
            

        }

        private void btnPlay_Click(object sender, EventArgs e)
        {
            wReader = new StreamReader("sap.wav");
            while (wReader.EndOfStream == false)
            {
                wReader.Read(bytesRead, 0, 100000);
            }
            buffer = new SecondaryBuffer("sap.wav", sndDevice);
            buffer.Play(0, BufferPlayFlags.Looping);
        }

        private void btnStop_Click(object sender, EventArgs e)
        {
            captureBuffer.Stop();
            wStream.Close();
        }

        private void btnRecord_Click(object sender, EventArgs e)
        {
            wStream = new StreamWriter("sap.wav");
            captureBuffer.Start(true);
            for (int i = 0; i < 100000; i++)
            {
                bytes[i] = (char)captureBuffer.Caps.BufferBytes;
                wStream.Write(bytes[i]);
            }
        }
    }
}

Thanks in advance .
SAP