the file received as empty while sending using TCP

TcpListener list = new TcpListener(localAddr, port);
           list.Start();
           TcpClient client  = list.AcceptTcpClient();//accepting connection with client when send button is clicked there .. !
           StreamReader s = new StreamReader(client.GetStream());
           Stream st = client.GetStream();
           rd = s.ReadLine();
           //FileStream fileStream = new FileStream(textBox1.Text + "\\" + rd.Substring(0, rd.LastIndexOf('.')), FileMode.Create, FileAccess.Write, FileShare.ReadWrite);//new file stream

           FileStream fileStream = new FileStream(folderBrowserDialog1.SelectedPath , FileMode.OpenOrCreate, FileAccess.ReadWrite, FileShare.ReadWrite);//new file stream

           int byteSize = 0;
           byte[] b1 = new byte[2048];



           while ((byteSize = st.Read(b1, 0, b1.Length)) > 0)//if stream read any thing that mean the file didn't finish yet !
           {
             fileStream.Write(b1, 0, byteSize);//write data in file till it finishes


           }