C#局域网通信(Socket)

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

namespace NetClient
{
    public partial class SocketClient : Form
    {
        Socket s;
        int count = 0;//计数器,若连接远程主机后,远程主机关闭,则接受的信息就为空,当10次为空后自动断开连接
        IPEndPoint ipEndPoint;
        Thread thread;

        public SocketClient()
        {
            InitializeComponent();
        }

        private void SocketClient_Load(object sender, EventArgs e)
        {
            IPAddress[] ip = Dns.GetHostAddresses(Dns.GetHostName());

            this.textBox1.Text = ip[0].ToString();//默认的主机IP
            
        }

        /// <summary>
        /// 连接远程主机
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void button1_Click(object sender, EventArgs e)
        {
            s = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
            IPAddress ip;//主机IP
            int port;//主机端口号
            try
            {
                ip = IPAddress.Parse(this.textBox1.Text.Trim());//远程主机IP
            }
            catch (Exception ex)
            {
                MessageBox.Show("IP地址错误！");
                this.textBox1.Focus();
                return;
            }

            try
            {
                port = Convert.ToInt32(this.textBox2.Text.Trim());//远程主机端口号
            }
            catch (Exception ex)