多任务tcp服务器异步？

Question

接受客户端 Start功能只会启动...而且永远不会结束

void Start(){
StartListening();//when the server starting
}
void StartListening(){
server.BeginAcceptTcpClient (AcceptTcpClient,server);
}
void AcceptTcpClient(IAsyncResult ar){
        TcpListener listener = (TcpListener)ar.AsyncState;
        clients.Add (new ServerClient (listener.EndAcceptTcpClient (ar)));
        StartListening ();
    }

侦听客户端 Update函数将每毫秒运行一次。

void Update(){   foreach (ServerClient c in clients.ToList()) {
            //is the client still connected
                if (!isConnected (c.tcp)) {
                    c.tcp.Close ();
                    disconnectList.Add (c);
                    continue;
                } else { 
                    NetworkStream s = c.tcp.GetStream ();
                    if(s.DataAvailable){
                        StreamReader reader = new StreamReader (s,true);
                        string data = reader.ReadLine ();
                        if (data != null)
                            OnIncomingData (c,data);                                        
                    }
                }
            }}

这不是完全代码，但我认为它足以理解我的问题。问题是服务器代码可以同时处理多个客户端吗？ ..或者在连接或从服务器接收时会冻结。

P.S

 private bool isConnected(TcpClient c){
        try{
            if(c!=null && c.Client!=null && c.Client.Connected){
                if(c.Client.Poll(0,SelectMode.SelectRead)){
                    return !(c.Client.Receive(new byte[1],SocketFlags.Peek)==0);
                }
                return true;
            }else {
                return false;}
        }
        catch {

            return false;
        }
    }