C# 聊天 服务器如何转发给其他客户端（最好能用集合！） 求~

C# 聊天 服务器怎么转发给其他客户端（最好能用集合！） 求~~~
 public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
            this.FormClosing += new FormClosingEventHandler(Form1_FormClosing);
        }
        
        TcpClient newclient=null ;
        Thread nth=null ;

        Boolean star = true  ;
        Thread rd=null ;
        NetworkStream ns = null;
        BinaryReader nsr = null;
        BinaryWriter nsw = null;

       
        public static  IPAddress localaddr = IPAddress.Parse("127.0.0.1");

        TcpListener listener = new TcpListener(localaddr  ,8888);

        private void button1_Click(object sender, EventArgs e)
        {   
            listener.Start();
            textBox1.Text = "服务器启动";
            nth = new Thread(new ThreadStart (clientconnect ));
            nth.Start();
          

        }

       private  void clientconnect() 
        {
            int count=1;
            while (star)
            {

                try
                {
                    newclient = listener.AcceptTcpClient();
                    textBox1.Text = textBox1.Text+"有"+count +"个客户连接了！\n";
                   
                }
                catch {  }
               rd = new Thread(new ThreadStart (receivedata ));
               rd.Start();
               count++;
            }
        }
       private void receivedata() 
       {
            ns = newclient.GetStream();
           nsr = new BinaryReader(ns);
            nsw = new BinaryWriter(ns);
           star = true;
           while (star)
           {
               string str = nsr.ReadString();
               textBox1.Text = str;    
              
           }
           nsr.Close();
           nsw.Close();
           ns.Close();
       }
   private void Form1_FormClosing(object sender, FormClosingEventArgs e)
       {
           if(!ns = null;)ns.Close();