以下是同步聊天程序的客户端源代码。其中的一些过程可以参考服务器端源码

using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
using System.Net;
using System.Net.Sockets;
using System.Threading;
using System.Text;
namespace 聊天_socket_client
{
/// <summary>
/// Form1 的摘要说明。
/// </summary>
public class Form1 : System.Windows.Forms.Form
{
private System.Windows.Forms.Label label4;
private System.Windows.Forms.Label label3;
private System.Windows.Forms.Label label2;
private System.Windows.Forms.Label label1;
private System.Windows.Forms.Button btnStop;
private System.Windows.Forms.Button btnSend;
private System.Windows.Forms.TextBox txtPort;
private System.Windows.Forms.TextBox txtServer;
private System.Windows.Forms.RichTextBox rtbSend;
private System.Windows.Forms.RichTextBox rtbReceive;
private System.Windows.Forms.StatusBar statusBar1;
private System.Windows.Forms.Button btnConnect;
private IPAddress hostIPAddress;
private IPEndPoint Server;
private Socket sock;
/// <summary>
/// 必需的设计器变量。
/// </summary>
private System.ComponentModel.Container components = null;

public Form1()
{
//
// Windows 窗体设计器支持所必需的
//
InitializeComponent();

//
// TODO: 在 InitializeComponent 调用后添加任何构造函数代码
//
}

/// <summary>
/// 清理所有正在使用的资源。
/// </summary>
protected override void Dispose( bool disposing )
{
if( disposing )
{
if (components != null)
{
components.Dispose();
}
}
base.Dispose( disposing );
}

#region Windows 窗体设计器生成的代码
/// <summary>
/// 设计器支持所需的方法 - 不要使用代码编辑器修改
/// 此方法的内容。
/// </summary>
private void InitializeComponent()
{
this.label4 = new System.Windows.Forms.Label();
this.label3 = new System.Windows.Forms.Label();
this.label2 = new System.Windows.Forms.Label();
this.label1 = new System.Windows.Forms.Label();
this.btnStop = new System.Windows.Forms.Button();
this.btnSend = new System.Windows.Forms.Button();
this.btnConnect = new System.Windows.Forms.Button();
this.txtPort = new System.Windows.Forms.TextBox();
this.txtServer = new System.Windows.Forms.TextBox();
this.rtbSend = new System.Windows.Forms.RichTextBox();
this.rtbReceive = new System.Windows.Forms.RichTextBox();
this.statusBar1 = new System.Windows.Forms.StatusBar();
this.SuspendLayout();
//
// label4
//
this.label4.Location = new System.Drawing.Point(16, 152);
this.label4.Name = "label4";
this.label4.Size = new System.Drawing.Size(64, 23);
this.label4.TabIndex = 22;
this.label4.Text = "发送信息:";
//
// label3
//
this.label3.Location = new System.Drawing.Point(16, 64);
this.label3.Name = "label3";
this.label3.Size = new System.Drawing.Size(64, 23);
this.label3.TabIndex = 21;
this.label3.Text = "接收信息:";
//
// label2
//
this.label2.Location = new System.Drawing.Point(216, 16);
this.label2.Name = "label2";
this.label2.Size = new System.Drawing.Size(64, 23);
this.label2.TabIndex = 20;
this.label2.Text = "监听端口:";
//
// label1
//
this.label1.Location = new System.Drawing.Point(16, 16); <