探测端口！

Question

我现在知道一个IP 61.203.487.84 和一个端口 123要怎样使得这个探测的时间很短 不至于让用户等得不耐烦
下面是我的代码！ 
foreach (DataGridViewRow row in this.Dgvdete.Rows)
            {
              string ips= row.Cells[0].Value.ToString();
              string port= row.Cells[1].Value.ToString();
              IPAddress ip = IPAddress.Parse(ips);
              DataGridViewImageCell imgcell = (DataGridViewImageCell)row.Cells[2];
              imgcell.Value = imageList1.Images[1];
              try
              {
                      IPEndPoint point = new IPEndPoint(ip, Convert.ToInt32(port));
                      Socket sock = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
                      sock.SendTimeout = 1;
                      sock.Connect(point);
                      imgcell.Value = imageList1.Images[0];
                  //Execute(string dosCommand, int milliseconds)
              }
              catch
              {
                  imgcell.Value = imageList1.Images[1];
              }
            }我现在的问题是当一个端口没有开发的时候!在探测的时候要等一段时间大约是（30多秒）
我该怎样使得它的探测时间在1到2秒！

Answer 1

/// <summary>
        /// 启动连接
        /// </summary>
        private bool Connection(string DeviceIP, int DevicePort)
        {
            try
            {
                tcpClientSocket = new TcpClient();
                if (!Connect(DeviceIP, DevicePort, 1000))
                {
                    return false;
                }
                tcpClientSocket.SendTimeout = 3000;
                tcpClientSocket.ReceiveTimeout = 3000;
                //tcpClientSocket.Connect(DeviceIP, DevicePort);  
                ns = tcpClientSocket.GetStream();
                ns.WriteTimeout = 1000;
                strReader = new StreamReader(ns);
                
                return true;
            }
            catch (Exception ex)
            {
                return false;
            }
        }        private bool IsConnectionSuccessful = false;
        private Exception socketexception;
        private ManualResetEvent TimeoutObject = new ManualResetEvent(false);        public bool Connect(string serverip, int serverport, int timeoutMSec)
        {
            TimeoutObject.Reset();
            socketexception = null;
            tcpClientSocket = new TcpClient();            tcpClientSocket.BeginConnect(serverip, serverport,
            new AsyncCallback(CallBackMethod), tcpClientSocket);            if (TimeoutObject.WaitOne(timeoutMSec, false))
            {
                if (IsConnectionSuccessful)
                {
                    return true;
                }
                else
                {
                    return false;
                }
            }
            else
            {
                tcpClientSocket.Close();
                return false;
            }
        }
        private void CallBackMethod(IAsyncResult asyncresult)
        {
            try
            {
                IsConnectionSuccessful = false;
                TcpClient tcpclient = asyncresult.AsyncState as TcpClient;                if (tcpclient.Client != null)
                {
                    tcpclient.EndConnect(asyncresult);
                    IsConnectionSuccessful = true;
                }
            }
            catch (Exception ex)
            {
                IsConnectionSuccessful = false;
                socketexception = ex;
            }
            finally
            {
                TimeoutObject.Set();
            }
        }以前写的，希望对你有帮助