try
            {
                byte[] data = new byte[1024];
                string msg;

                //构建UDP服务器

                // Console.WriteLine("This is a Client, host name is {0}", Dns.GetHostName());

                //设置服务IP，设置UDP端口号


                //定义网络类型，数据连接类型和网络协议UDP
                

                string welcome = "L" + UserHelper.loginUser.id.ToString();
                data = Encoding.UTF8.GetBytes(welcome);
                sokClient.SendTo(data, data.Length, SocketFlags.None, ipep);
                byte[] arrMsg2 = System.Text.Encoding.UTF8.GetBytes("H"+UserHelper.loginUser.id.ToString());
                sokClient.SendTo(arrMsg2, arrMsg2.Length, SocketFlags.None,ipep);

                IPEndPoint sender = new IPEndPoint(IPAddress.Any, 0);
                EndPoint Remote = (EndPoint)sender;
                data = new byte[1024];
                //对于不存在的IP地址，加入此行代码后，可以在指定时间内解除阻塞模式限制
                //server.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReceiveTimeout, 100);
                int recv = sokClient.ReceiveFrom(data, ref Remote);
                Console.WriteLine(" from {0}: ", Remote.ToString());
                Console.WriteLine(Encoding.UTF8.GetString(data, 0, recv));
                

                while (true)
                {




                    //server.SendTo(Encoding.UTF8.GetBytes("ok"), Remote);
                    data = new byte[1024];
                    recv = sokClient.ReceiveFrom(data, ref Remote);
                    msg = Encoding.UTF8.GetString(data, 0, recv);

                    if (msg.Length > 0)
                    {
                        string headCommand = msg.Substring(0, 1);

                        switch (headCommand)
                        {
                            case "N":
                                string content = msg.Substring(1);
                                //MsgNewsForm mnf = new MsgNewsForm(content);
                              //  MsgPresentationManage.GetInstance().AddMsgNewsForm(mnf);

                                MessageBox.Show(msg);

                                break;
                            case "M":
                                string sendUserId = msg.Substring(1);
                                OAUsers user = userBLL.GetModel(int.Parse(sendUserId));
                                UserHelper.SendUserName = user.userName;
                                timerSend.Enabled = true;
                                timerSend.Start();
                                notifyIcon1.Icon = PPSoft.Properties.Resources._1;
                                break;
                            case "H":
                                string heartUserId = msg.Substring(1);
                                Console.WriteLine(heartUserId + "发来的心跳包");
                                break;
                            default: break;
                        }

                    }

                    Console.WriteLine(msg);
                }
            }
            catch (Exception ex)
            {
                
               
            }