写socket服务报错，请贵人相助

问题描述：
    System.Net.Sockets.SocketException: 由于套接字没有连接并且(当使用一个 sendto 调用发送数据报套接字时)没有提供地址，发送或接收数据的请求没有被接受。
   at System.Net.Sockets.Socket.get_RemoteEndPoint()
   at UtilitesCEBSocket.ClientSocket.ConnectCallback(IAsyncResult ar)

详细代码：
       /// <summary>
        /// 客户端连接远程服务入口
        /// </summary>
        /// <param name="argMsg">发送的信息</param>
        /// <returns>发送成功返回0</returns>
        public string StartClient(string argMsg)
        {

            LogBLL.Debug("客户端开始：");
            // Create a TCP/IP socket.
            Socket client = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
            client.SendTimeout = SendTimeout;
            client.ReceiveTimeout = ReceiveTimeout;
            LogBLL.Debug("客户端连接到远程服务开始：");

            IPAddress ipAddress = IPAddress.Parse(ClientIP);
            IPEndPoint remoteEP = new IPEndPoint(ipAddress, ClientPort);

            // Connect to the remote endpoint. 连接到远程端点
            client.BeginConnect(remoteEP, new AsyncCallback(ConnectCallback), client);
            connectDone.WaitOne();
            // Send test data to the remote device.
            Send(client, argMsg);
            sendDone.WaitOne();
            // Release the socket.
            client.Shutdown(SocketShutdown.Both);
            client.Close();
            LogBLL.Debug("客户端结束：");
            //Console.Read();
            return "0";
        }

        /// <summary>
        /// 异步连接
        /// </summary>
        /// <param name="ar"></param>
        private void ConnectCallback(IAsyncResult ar)
        {
            //处理线程的异常
            try
            {

                LogBLL.Info("客户端连接到1：{ 开始 }");

                //判断网络ip和端口号是否正常
                IsOpenPort();

                // Retrieve the socket from the state object.
                Socket client = (Socket)ar.AsyncState;
                LogBLL.Info("客户端连接到2：{" + client.RemoteEndPoint.ToString() + "}");

                // Complete the connection.
                client.EndConnect(ar);

                //Console.WriteLine("Socket connected to {0}", client.RemoteEndPoint.ToString());
                LogBLL.Info("客户端连接到3：{ 结束}");

                // Signal that the connection has been made.
                connectDone.Set();
            }
            catch (Exception ex)
            {
                LogBLL.Error("ConnectCallback Call接口有问题：" + ex.ToString());
                throw ex;
            }

        }
        //检测对方端口是否通
        public void IsOpenPort()
        {
            string ip = ClientIP;
            int port = ClientPort;

            bool tcpListen = false;
            bool udpListen = false;//设定端口状态标识位
            System.Net.IPAddress myIpAddress = IPAddress.Parse(ip);
            System.Net.IPEndPoint myIpEndPoint = new IPEndPoint(myIpAddress, port);
            try
            {
                System.Net.Sockets.TcpClient tcpClient = new TcpClient();
                tcpClient.Connect(myIpEndPoint);//对远程计算机的指定端口提出TCP连接请求
                tcpListen = true;
                System.Net.Sockets.UdpClient udpClient = new UdpClient();
                udpClient.Connect(myIpEndPoint);//对远程计算机的指定端口提出UDP连接请求
                udpListen = true;
                if (tcpListen == false && udpListen == false)//7411端口关闭！","提示
                {
                    LogBLL.Error("失败连接ip为：" + ip + " 端口为：" + port);
                }
                else
                {
                    LogBLL.Info("成功连接至对方！" + ip + " 端口为：" + port);
                }
            }
            catch (Exception ex)
            {
                LogBLL.Error("连接对方报错信息如下："+ex);
            }
        }
        /// <summary>
        /// 发送数据
        /// </summary>
        /// <param name="client">客户端SOCKET</param>
        /// <param name="data">发送的数据</param>
        private void Send(Socket client, String data)
        {
            LogBLL.Info("客户端开始发送数据：" + data);
            // Convert the string data to byte data using ASCII encoding.
            Encoding encode = Encoding.GetEncoding(936); //gbk
            byte[] byteData = encode.GetBytes(data);
            // Begin sending the data to the remote device.
            client.BeginSend(byteData, 0, byteData.Length, 0, new AsyncCallback(SendCallback), client);
            LogBLL.Info("发送报文的长度：" + byteData.Length + "发送内容：" + data);
            LogBLL.Info("客户端发送数据结束");
        }

        /// <summary>
        /// 发送回调
        /// </summary>
        /// <param name="ar"></param>
        private void SendCallback(IAsyncResult ar)
        {
            // Retrieve the socket from the state object.
            Socket client = (Socket)ar.AsyncState;
            // Complete sending the data to the remote device.
            int bytesSent = client.EndSend(ar);
            //Console.WriteLine("Sent {0} bytes to server.", bytesSent);
            LogBLL.Info("客户端发送 {" + bytesSent + "} bytes 远程服务端.");
            // Signal that all bytes have been sent.
            sendDone.Set();
        }

补充：.NET技术 ,  C#