在C#中双重发送？

using System;
using System.IO;
using System.Net.Sockets;

class Program
{
    static void Main(string[] args)
    {
        string data = "Hello, world!";
        byte[] buffer = System.Text.Encoding.UTF8.GetBytes(data);

        byte[] header = new byte[4];
        header[0] = (byte)(buffer.Length >> 24);
        header[1] = (byte)(buffer.Length >> 16);
        header[2] = (byte)(buffer.Length >> 8);
        header[3] = (byte)buffer.Length;

        byte[] packet = new byte[header.Length + buffer.Length];
        Array.Copy(header, packet, header.Length);
        Array.Copy(buffer, 0, packet, header.Length, buffer.Length);

        TcpClient client = new TcpClient("localhost", 8080);
        NetworkStream stream = client.GetStream();
        stream.Write(packet, 0, packet.Length);
        stream.Close();
        client.Close();
    }
}