private void DisplayYD()
        {           
            int ipindex = 4;
            byte[] namestr8 = new byte[8];
            byte[] ipstr16 = new byte[16];
            byte[] macstr20 = new byte[20];
            byte[] recvBuff = new byte[MaxFrameLength];
            int IpIndex = 0;
            while (udpRecv_YD.isEmpty() == false)
            {
                int n = udpRecv_YD.PopOneRecv(ref recvBuff, ref IpIndex);

                for (int i = 0; i < 8; i++)
                {
                    namestr8[i] = 0;
                }
                for (int i = 0; i < 16; i++)
                {
                    ipstr16[i] = 0;
                }
                for (int i = 0; i < 20; i++)
                {
                    macstr20[i] = 0;
                }
                if (n == 0)
                {
                    return;
                }
                if ((recvBuff[0] == 0xeb) && (recvBuff[1] == 0x90) && (recvBuff[2] == 0x06))
                {
                    ipindex = 4;
                    for (int i = 0; i < 8; i++)
                    {
                        namestr8[i] = recvBuff[ipindex++];
                    }

                    string namestr1 = System.Text.Encoding.Default.GetString(namestr8);
                    DataGridViewRow row1 = new DataGridViewRow();
                    row1.CreateCells(this.dataGridView2);
                    row1.Cells[0].Value = (bool)false;
                    row1.Cells[1].Value = namestr1; //

                    for (int i = 0; i < 8; i++)
                    {
                        namestr8[i] = recvBuff[ipindex++];
                    }
                    string namestr2 = System.Text.Encoding.Default.GetString(namestr8);
                    row1.Cells[2].Value = namestr2; //

                    for (int i = 0; i < 16; i++)
                    {
                        ipstr16[i] = recvBuff[ipindex++];
                    }
                    string namestr3 = System.Text.Encoding.Default.GetString(ipstr16);
                    row1.Cells[3].Value = namestr3; //


                    for (int i = 0; i < 20; i++)
                    {
                        macstr20[i] = recvBuff[ipindex++];
                    }
                    string namestr4 = System.Text.Encoding.Default.GetString(macstr20);
                    row1.Cells[4].Value = namestr4; //


                    for (int i = 0; i < 16; i++)
                    {
                        ipstr16[i] = recvBuff[ipindex++];
                    }
                    string namestr5 = System.Text.Encoding.Default.GetString(ipstr16);
                    row1.Cells[5].Value = namestr5; //

                    for (int i = 0; i < 20; i++)
                    {
                        macstr20[i] = recvBuff[ipindex++];
                    }
                    string namestr6 = System.Text.Encoding.Default.GetString(macstr20);
                    row1.Cells[6].Value = namestr6; //


                    row1.Cells[7].Value = "root"; //
                    row1.Cells[8].Value = "jdyd2013"; //

                    if (dataGridView2.Rows.Count == 0)
                    {
                        dataGridView2.Rows.Add(row1);
                    }
                    else
                    {
                        int sameCol = 0;
                        bool sameYD = false;
                        for (int m = 0; m < dataGridView2.Rows.Count; m++)
                        {
                            sameCol = 0;
                            for (int k = 1; k < 7; k++)
                            {
                                if (dataGridView2.Rows[m].Cells[k].Value.ToString() == row1.Cells[k].Value.ToString())
                                {
                                    sameCol++;
                                }
                                    
                            }
                            if (sameCol == 6)
                            {
                                sameYD = true;
                                break;
                            }
                        }
                        if (sameYD == false)
                        {
                            dataGridView2.Rows.Add(row1);
                        }
                    }

                }
            }
        }

         private void InitUDPSocket_YD()
       {
          
           InitIPAddress();          

           if (udpclients_YD == null)
           {
               //8004是对方侦听端口
               udpclients_YD = new UDPClients("255.255.255.255", "8004", "ASYN");//指定对方的接收端口
               udpclients_YD.InitUdpSocket(LocalIPAddress[0], 7004);//
           }
          

           if (Udpserver_YD == null)
           {               
               Udpserver_YD = new UDPService("7004", "ASYN");
               Udpserver_YD.InitUdpSocket();
               Udpserver_YD.EV_ReceiveData += new NetEvent(this.UDPRecvData_YD);

               Udpserver_YD.StartReceive();
               
           }

           if ((udpclients_YD != null) && (Udpserver_YD != null))
           {
               timer3.Start();

               byte len = 11;
               byte[] data = new byte[len];
               data[0] = 0xeb;
               data[1] = 0x90;
               data[2] = 0x05;

               data[3] = 0x08;

               data[4] = 0;
               data[5] = (byte)(DateTime.Now.Second);
               data[6] = (byte)DateTime.Now.Minute;
               data[7] = (byte)DateTime.Now.Hour;
               data[8] = (byte)DateTime.Now.Day;
               data[9] = (byte)DateTime.Now.Month;
               data[10] = (byte)DateTime.Now.Year;

               udpclients_YD.Send2(data);
           }

          
       }