socket udp无连接通信

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Net;
using System.Net.Sockets;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace Socket_Client
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            var obj = new UserModel() { Id = "123", Name = "张三" };
            var json = Newtonsoft.Json.JsonConvert.SerializeObject(obj);
            Socket socket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
            socket.SendTo(Encoding.UTF8.GetBytes(json), new IPEndPoint(IPAddress.Parse("127.0.0.1"), 3333));
        }
    }

    public class UserModel
    {
        public string Id { get; set; }

        public string Name { get; set; }
    }
}

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Net;
using System.Net.Sockets;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace Socket_Server
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
            TextBox.CheckForIllegalCrossThreadCalls = false;
        }

        private void button1_Click(object sender, EventArgs e)
        {
            this.textBox1.Text = "开始监听....";
            Socket socket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
            socket.Bind(new IPEndPoint(IPAddress.Parse("127.0.0.1"), 3333));
            Thread recTh = new Thread(Recive);
            recTh.Start(socket);
        }

        private void Recive(object obj)
        {
            byte[] buffer = new byte[1024];
            var socket = obj as Socket;
            while (true)
            {
                int count = socket.Receive(buffer);
                var msg = Encoding.UTF8.GetString(buffer, 0, count);
                this.textBox1.Text = this.textBox1.Text + "\r\n" + msg;
            }
        }
    }
}