c# socket异步通信
下面是我的c# socket异步接受发送数据的代码？第一次发送请求的时候，send数据是成功的，当客户端点击按钮再次请求时，就会报“不可访问已释放资源”，有谁可不可以帮我修改一下啊，（客户端会发送很多次请求）
public class StateObject
{
public Socket workSocket = null;

public const int BufferSize = 1024;

public byte[] buffer = new byte[BufferSize];

public StringBuilder sb = new StringBuilder();
}

public class AsynchronousSocketListener
{
public static Thread mythread; //监听数据
public static Thread mythreadReceive; //为每个用户创建新的进程

public static IPHostEntry ipHostInfo = Dns.Resolve(Dns.GetHostName());
public static IPAddress ipAddress = ipHostInfo.AddressList[0];
public static string data = null;

public static ManualResetEvent allDone = new ManualResetEvent(false);

public AsynchronousSocketListener()
{
}

public static void StartListening()
{

ipHostInfo = Dns.Resolve(Dns.GetHostName());
ipAddress = ipHostInfo.AddressList[0];



IPEndPoint localEndPoint = new IPEndPoint(ipAddress, 843);

Socket listener = new Socket(AddressFamily.InterNetwork,

SocketType.Stream, ProtocolType.Tcp);
try
{
listener.Bind(localEndPoint);
listener.Listen(0);
while (true)
{

allDone.Reset();
Console.WriteLine("Waiting for a connection...");

listener.BeginAccept(
new AsyncCallback(AcceptCallback),
listener);
allDone.WaitOne();
}

}
catch (Exception e)
{
Console.WriteLine(e.ToString());
}
// Console.WriteLine("Press ENTER to continue...");
// Console.Read();

}


public static void AcceptCallback(IAsyncResult ar)
{
allDone.Set();
Socket listener = (Socket)ar.AsyncState;
Socket handler = listener.EndAccept(ar);

StateObject state = new StateObject();
state.workSocket = handler;


handler.BeginReceive(state.buffer, 0, StateObject.BufferSize, 0,
new AsyncCallback(ReadCallback), state);
}

public static void ReadCallback(IAsyncResult ar)
{
String content = String.Empty;
StateObject state = (StateObject)ar.AsyncState;
Socket handler = state.workSocket;

int bytesRead = handler.EndReceive(ar);
if (bytesRead > 0)
{
state.sb.Append(Encoding.ASCII.GetString(
state.buffer, 0, bytesRead));

content = state.sb.ToString();

Console.WriteLine("Read {0} bytes from socket.\n Data:{1}", content.Length, content);

string xml = "<cross-domain-policy>";
if (content.Length >= 22)
{

}
Send(handler, xml);
}
}



//向客户端传数据
private static void Send(Socket handler, String data)
{
byte[] byteData = Encoding.ASCII.GetBytes(data);

handler.BeginSend(byteData, 0, byteData.Length, 0,
new AsyncCallback(SendCallback), handler);
}

private static void SendCallback(IAsyncResult ar)
{
try
{
Socket handler = (Socket)ar.AsyncState;

int bytesSent = handler.EndSend(ar);
Console.WriteLine("Sent {0} bytes to client.", bytesSent);
handler.Shutdown(SocketShutdown.Both);
handler.Close();
}
catch (Exception e)
{
Console.WriteLine(e.ToString());
}
}

[解决办法]
http://www.cnblogs.com/light169/articles/1240202.html
[解决办法]