服务器端:

using System;
using System.Collections.Generic;
using System.Text;
using System.Net;
using System.Net.Sockets;
using System.Threading;
namespace AsyncServer
{
    public class UdpState
    {
        public UdpClient udpClient;
        public IPEndPoint ipEndPoint;
        public const int BufferSize = 1024;
        public byte[] buffer = new byte[BufferSize];
        public int counter = 0;
    }
    public class AsyncUdpSever
    {
        private IPEndPoint ipEndPoint = null;
        private IPEndPoint remoteEP = null;
        private UdpClient udpReceive = null;
        private UdpClient udpSend = null;
        private const int listenPort = 1100;
        private const int remotePort = 1101;
        UdpState udpReceiveState = null;
        UdpState udpSendState = null;
        private ManualResetEvent sendDone = new ManualResetEvent(false);
        private ManualResetEvent receiveDone = new ManualResetEvent(false);
        public AsyncUdpSever()
        {
            ipEndPoint = new IPEndPoint(IPAddress.Any, listenPort);
            remoteEP = new IPEndPoint(Dns.GetHostAddresses(Dns.GetHostName())[0], remotePort);
            udpReceive = new UdpClient(ipEndPoint);
            udpSend = new UdpClient();
            udpReceiveState = new UdpState();            
            udpReceiveState.udpClient = udpReceive;
            udpReceiveState.ipEndPoint = ipEndPoint;

            udpSendState = new UdpState();
            udpSendState.udpClient = udpSend;
            udpSendState.ipEndPoint = remoteEP;
        }
        public void ReceiveMsg()
        {
            Console.WriteLine("listening for messages");
            while(true)
            {
                lock (this)
                {   
                    IAsyncResult iar = udpReceive.BeginReceive(new AsyncCallback(ReceiveCallback), udpReceiveState);
                    receiveDone.WaitOne();
                    Thread.Sleep(100);
                }
            }
        }
        private void ReceiveCallback(IAsyncResult iar)
        {
            UdpState udpReceiveState = iar.AsyncState as UdpState;
            if (iar.IsCompleted)
            {
                Byte[] receiveBytes = udpReceiveState.udpClient.EndReceive(iar, ref udpReceiveState.ipEndPoint);
                string receiveString = Encoding.ASCII.GetString(receiveBytes);
                Console.WriteLine("Received: {0}", receiveString);
                //Thread.Sleep(100);
                receiveDone.Set();
                SendMsg();
            }
        }

        private void SendMsg()
        {
            udpSend.Connect(udpSendState.ipEndPoint);
            udpSendState.udpClient = udpSend;
            udpSendState.counter ++;

            string message = string.Format("第{0}个UDP请求处理完成!",udpSendState.counter);
            Byte[] sendBytes = Encoding.Unicode.GetBytes(message);
            udpSend.BeginSend(sendBytes, sendBytes.Length, new AsyncCallback(SendCallback), udpSendState);
            sendDone.WaitOne();
        }
        private void SendCallback(IAsyncResult iar)
        {
            UdpState udpState = iar.AsyncState as UdpState;
            Console.WriteLine("第{0}个请求处理完毕!", udpState.counter);
            Console.WriteLine("number of bytes sent: {0}", udpState.udpClient.EndSend(iar));
            sendDone.Set();
        }

        public static void Main()
        {
            AsyncUdpSever aus = new AsyncUdpSever();
            Thread t = new Thread(new ThreadStart(aus.ReceiveMsg));
            t.Start();
            Console.Read();
        }
    }
}

客户端:

using System;
using System.Collections.Generic;
using System.Text;
using System.Net;
using System.Net.Sockets;
using System.Threading;
namespace AsyncClient
{
    public class UdpState
    {
        public UdpClient udpClient = null;
        public IPEndPoint ipEndPoint = null;
        public const int BufferSize = 1024;
        public byte[] buffer = new byte[BufferSize];
        public int counter = 0;
    }
    public class AsyncUdpClient
    {
        public static bool messageSent = false;
        // Receive a message and write it to the console.
        private const int listenPort = 1101;
        private const int remotePort = 1100;
        private IPEndPoint localEP = null;
        private IPEndPoint remoteEP = null;
        private UdpClient udpReceive = null;
        private UdpClient udpSend = null;
        private UdpState udpSendState = null;
        private UdpState udpReceiveState = null;
        private int counter = 0;
        private ManualResetEvent sendDone = new ManualResetEvent(false);
        private ManualResetEvent receiveDone = new ManualResetEvent(false);
        private Socket receiveSocket;
        private Socket sendSocket;
        public AsyncUdpClient()
        {
            localEP = new IPEndPoint(IPAddress.Any, listenPort);
            remoteEP = new IPEndPoint(Dns.GetHostAddresses(Dns.GetHostName())[0],remotePort);
            udpReceive = new UdpClient(localEP);            
            udpSend = new UdpClient();

            udpSendState = new UdpState();
            udpSendState.ipEndPoint = remoteEP;
            udpSendState.udpClient = udpSend;

            udpReceiveState = new UdpState();
            udpReceiveState.ipEndPoint = remoteEP;
            udpReceiveState.udpClient = udpReceive;

            receiveSocket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
            receiveSocket.Bind(localEP);

            sendSocket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
            sendSocket.Bind(remoteEP);
        }
        public void SendMsg()
        {   
            udpSend.Connect(remoteEP);

            //Thread t = new Thread(new ThreadStart(ReceiveMessages));
            //t.Start();
            Byte[] sendBytes;
            string message;            
            while (true)
            {   
                message = "Client" + (counter++).ToString();
                lock (this)
                {
                    sendBytes = Encoding.ASCII.GetBytes(message);
                    udpSendState.counter = counter;
                    udpSend.BeginSend(sendBytes, sendBytes.Length, new AsyncCallback(SendCallback), udpSendState);
                    sendDone.WaitOne();
                    Thread.Sleep(200);
                    ReceiveMessages();
                }
            }             
        }

        public void SendCallback(IAsyncResult iar)
        {
            UdpState udpState = iar.AsyncState as UdpState;
            if (iar.IsCompleted)
            {
                Console.WriteLine("第{0}个发送完毕!", udpState.counter);
                Console.WriteLine("number of bytes sent: {0}", udpState.udpClient.EndSend(iar));
                //if (udpState.counter == 10)
                //{
                //    udpState.udpClient.Close();
                //}
                sendDone.Set();
            }            
        }

        public void ReceiveMessages()
        {
            lock (this)
            {
                udpReceive.BeginReceive(new AsyncCallback(ReceiveCallback), udpReceiveState);
                receiveDone.WaitOne();
                Thread.Sleep(100);
            }   
        }
        public void ReceiveCallback(IAsyncResult iar)
        {
            UdpState udpState = iar.AsyncState as UdpState;
            if (iar.IsCompleted)
            {
                Byte[] receiveBytes = udpState.udpClient.EndReceive(iar, ref udpReceiveState.ipEndPoint);
                string receiveString = Encoding.Unicode.GetString(receiveBytes);
                Console.WriteLine("Received: {0}", receiveString);
                receiveDone.Set();
            }            
        }

        public static void Main()
        {
            AsyncUdpClient auc = new AsyncUdpClient();
            auc.SendMsg();
            Console.Read();
        }
    }
}

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