端口扫描取值问题
我想把打开的端口，跟关闭的端口，结果放到两个list中去，求大牛们帮帮忙

C# code

static void Main(string[] args)          {                                    Scan(ip, startPort, endPort);   //端口扫描                                      }   static void Scan(IPAddress ip, int startPort, int endPort)          {              Random rand = new Random((int)DateTime.Now.Ticks);              Console.WriteLine("Begin Scan...");              for (int port = startPort; port < endPort; port++)              {                  Socket scanSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.IP);                  //寻找一个未使用的端口进行绑定                   do                  {                      try                      {                          scanSocket.Bind(new IPEndPoint(IPAddress.Any, rand.Next(65535)));                          break;                      }                      catch                      {                           //绑定失败                       }                  } while (true);                                   try                  {                      scanSocket.BeginConnect(new IPEndPoint(ip, port), ScanCallBack, new ArrayList() { scanSocket, port});                  }                  catch                  {                                         continue;                  }                              }                Console.WriteLine("Port Scan Completed!");          }            /// <summary>           /// BeginConnect的回调函数           /// </summary>           /// <param name="result">异步Connect的结果</param>           static void ScanCallBack(IAsyncResult result)          {              //解析 回调函数输入 参数               ArrayList arrList = (ArrayList)result.AsyncState;              Socket scanSocket = (Socket)arrList[0];              int port = (int)arrList[1];              //判断端口是否开放               if (result.IsCompleted && scanSocket.Connected)              {                                Console.WriteLine("port {0,5}\tOpen.", port);              }              else              {                   Console.WriteLine("port {0,5}\tClose.", port);              }              //关闭套接字               scanSocket.Close();          }