How to listen to TCP socket in C#

The code below illustrate how to listen to Tcp/Ip port for incoming stream.  The code can use to listen any port but some times you may encountered an exception (Refer).  

private void Run_Server()
{
    // Listen to our own port 80 (HTTP protocol port).
    IPAddress localAddr = IPAddress.Parse("127.0.0.1");
    TcpListener listen = new TcpListener(localAddr, 80);

    try
    {
        // Start listening
        listen.Start();
        Byte[] bytes = new byte[256];
        TcpClient client = listen.AcceptTcpClient();
        // This waits until we getting a connection
        NetworkStream stream = client.GetStream();

        int i;
        String data = null;

        while (stream.DataAvailable)
        {
            i = stream.Read(bytes, 0, bytes.Length);
            data = System.Text.Encoding.ASCII.GetString(bytes, 0, i);
            txtMessages.Text += data.ToString();
        }
        client.Close();
    }
    catch (SocketException exceptionError)
    {
        MessageBox.Show(exceptionError.Message);
    }
    finally
    {
        listen.Stop();
    }
}