UDP 自发自收程序

static void Main()
            // This constructor arbitrarily assigns the local port number.
            UdpClient udpClient = new UdpClient(11000);
                udpClient.Connect(IPAddress.Parse(""), 11000);

                // Sends a message to the host to which you have connected.
                Byte[] sendBytes = Encoding.ASCII.GetBytes("Is anybody there?");

                udpClient.Send(sendBytes, sendBytes.Length);

                // Sends a message to a different host using optional hostname and port parameters.
                UdpClient udpClientB = new UdpClient();
                udpClientB.Send(sendBytes, sendBytes.Length,"",11000);     //向备用主机发消息

                //IPEndPoint object will allow us to read datagrams sent from any source.
                IPEndPoint RemoteIpEndPoint = new IPEndPoint(IPAddress.Any, 8080);  //接收端接受所有信息

                // Blocks until a message returns on this socket from a remote host.
                Byte[] receiveBytes = udpClient.Receive(ref RemoteIpEndPoint);
                string returnData = Encoding.ASCII.GetString(receiveBytes, 0, receiveBytes.Length);

                // Uses the IPEndPoint object to determine which of these two hosts responded.
                Console.WriteLine("This is the message you received " +
                Console.WriteLine("This message was sent from " +
                                            RemoteIpEndPoint.Address.ToString() +
                                            " on their port number " +


            catch (Exception e)




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