problem with sending file C#

my problem is :
i make two programs one server and the second as client the client send files to server but when he receive it the size of received file is bigger than the sent file .

and thats the sent code

private void send_Click(object sender, EventArgs e)
{

    FileStream fs = new FileStream(@"c:\\file11.wav", FileMode.Open, FileAccess.Read);
    byte[] data= new byte[fs.Length];
    fs.Read(data, 0, data.Length);
   // Socket sck = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp); the line was declared as global variable
    sck.Send(BitConverter.GetBytes(data.Length), 0, 4, 0);// sending the size of file
    sck.Send(data);// sending the data

}

and at receiving we have this code

FileStream fs = new FileStream(@"c:\\jj.wav", FileMode.Create, FileAccess.Write);//creat a receiv file 
            sckt = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.IP);
            sckt.Bind(new IPEndPoint(0,08));
            sckt.Listen(1);
            acc = sckt.Accept();
            sckt.Close();
            new Thread(() =>
                {
                    while (true)
                    {
                        byte[] sizebuffer = new byte[4];
                        acc.Receive(sizebuffer, 0, sizebuffer.Length, 0);// receive the first packet how represent the file size
                        int size = BitConverter.ToInt32(sizebuffer, 0);
                       
// now we ll receive the rest of data
                        while (size > 0)
                        {
                            byte[] buffer;
                            if (size < acc.ReceiveBufferSize)
                            {
                                buffer = new byte[size];
                            }
                            else
                                buffer = new byte[acc.ReceiveBufferSize];
                            int rec = acc.Receive(buffer, 0, buffer.Length, 0);
                            size -= rec;
                            if (size < 0)
                            { size = 0; }
                            fs.Write(buffer, 0, buffer.Length);


                        }

if any one can help me plz i ll be so glade

Tags: Sockets