(Socket.SendTo)如何响应服务器开始接收的数据/将数据发送回客户端？C#

public int SendTo(byte[] buffer, int offset, int size, SocketFlags socketFlags, EndPoint remoteEP);

using System;
using System.Net;
using System.Net.Sockets;
using System.Text;

class Program
{
    static void Main()
    {
        // 创建一个UDP Socket
        Socket socket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);

        // 服务器的IP地址和端口号
        IPAddress serverIP = IPAddress.Parse("服务器IP地址");
        int serverPort = 12345;
        IPEndPoint serverEP = new IPEndPoint(serverIP, serverPort);

        // 发送数据到服务器
        string message = "Hello, server!";
        byte[] data = Encoding.UTF8.GetBytes(message);
        socket.SendTo(data, 0, data.Length, SocketFlags.None, serverEP);

        // 接收服务器返回的数据
        byte[] buffer = new byte[1024];
        EndPoint remoteEP = new IPEndPoint(IPAddress.Any, 0);
        int receivedBytes = socket.ReceiveFrom(buffer, ref remoteEP);
        string response = Encoding.UTF8.GetString(buffer, 0, receivedBytes);
        Console.WriteLine("Received from server: " + response);

        // 关闭Socket
        socket.Close();
    }
}