IPEndPoint ipep = new IPEndPoint(ip, port);//IP和端口

Socket sock = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);

                ConnectSocketDelegate connect = ConnectSocket;

                IAsyncResult asyncResult = connect.BeginInvoke(ipep, sock, null, null);

                bool connectSuccess = asyncResult.AsyncWaitHandle.WaitOne(TimeOut, false);

                if (!connectSuccess)

                {

                    MessageBox.Show(string.Format("失败！错误信息：{0}", "连接超时"));

                    return false;

                }

                string exmessage = connect.EndInvoke(asyncResult);

                if (!string.IsNullOrEmpty(exmessage))

                {

                    MessageBox.Show(string.Format("失败！错误信息：{0}", exmessage));

                    return false;

                }

                sock.Send(data);//发送信息

                reslen = sock.Receive(response, SocketFlags.None);//接收应答数据包

private delegate string ConnectSocketDelegate(IPEndPoint ipep, Socket sock);

        private string ConnectSocket(IPEndPoint ipep, Socket sock)

        {

            string exmessage = "";

            try

            {

                sock.Connect(ipep);

            }

            catch (System.Exception ex)

            {

                exmessage = ex.Message;

            }

            finally

            {

            }

            return exmessage;

        }