private void SendPacket(string MacAddress)
        {
            byte[] mac = new byte[6];
            for (int k = 0; k < 6; k++)
            {
                mac[k] = Byte.Parse(MacAddress.Substring(k * 2, 2), System.Globalization.NumberStyles.HexNumber);
            }
            System.Net.Sockets.UdpClient UdpClientTest = new System.Net.Sockets.UdpClient();
            UdpClientTest.Connect(System.Net.IPAddress.Broadcast, 40000);
            byte[] packet = new byte[17 * 6];
            for (int i = 0; i < 6; i++)
                packet[i] = 0xFF;
            for (int i = 1; i <= 16; i++)
            {
                for (int z = 0; z < 6; z++)
                {
                    packet[i * 6 + z] = mac[z];
                }
            }
            UdpClientTest.Send(packet, packet.Length);