MultiCasting Problem.

Most of you have seen this code posted below on the the net. I'm having problems with the thread, why will the thread not close properly Is there something here that you see that would be causing the issue It works great in a console application, but in a windows connection it faults on the stop method

I await your reply.

public class MCast

private UdpClient _client;

private int _listenerport = 8080;

private int _senderport = 8080;

private int _ttl = 20; //Time to Live

private bool _started = false;

private int LocalPort;

private int RemotePort;

private string _message = "";

private bool done = true;

private Thread t;

Encoding ASCII = Encoding.ASCII;

private string _szhostname;

private string _szusername;

private IPAddress _groupaddress = IPAddress.Parse("224.0.0.1");

private IPHostEntry _localhost;

private IPEndPoint _remoteep;

public event EventHandler Receive;

public void ReceiveMessage()

Receive(this, EventArgs.Empty);

public int ListenerPort

get { return _listenerport; }

set { _listenerport = value; }

public int SenderPort

get { return _senderport; }

set { _senderport = value; }

public int TTL

get { return _ttl; }

set { _ttl = value; }

public string GroupAddress

get { return _groupaddress.ToString(); }

set {_groupaddress = IPAddress.Parse(value);}

public string Message

get { return _message; }

set { _message = value; }

public string HostName

get { return _szhostname; }

public bool Initialize()

//Set Local and Remote Port Private Variables

//instatitate UdpClient

_client = new UdpClient(LocalPort);

//Join Group

try

catch

//throw new Exception("Unable ToString join MulticastDelegate group!", ex);

return false;

//Create Endpoint for peer

_remoteep = new IPEndPoint(_groupaddress, RemotePort);

_szhostname = Dns.GetHostName();

_localhost = Dns.GetHostEntry(_szhostname);

_szusername = Environment.UserName;

return true;

public bool Start()

try

t = new Thread(new ThreadStart(Listener));

t.IsBackground = true;

Encoding ASCII = Encoding.ASCII;

_started = true;

return true;

catch

MessageBox.Show("There is an Error!", "MCast.Start");

return false;

public void Stop()

try

done = true;

catch { MessageBox.Show("There is an Error!", "MCast.Stop"); }

public bool SendMsg(string Message)

Byte[] buffer = null;

if (_started && Message.Length > 0)

try

//Send message to Group

buffer = new Byte[Message.Length + 1];

int len = ASCII.GetBytes(Message.ToCharArray(), 0, Message.Length, buffer, 0);

int ecode = _client.Send(buffer, len, _remoteep);

if (ecode <= 0)

return false;

else

return true;

catch

MessageBox.Show("There is an Error!", "MCast.SendMsg");

return false;

return false;

public void Listener()

done = false;

Thread.Sleep(2000);

try

while (!this.done)

if (this.done == true)

break;

IPEndPoint ep = null;

Byte[] data = _client.Receive(ref ep);

string strData = ASCII.GetString(data);

catch (Exception ex)

MessageBox.Show(ex.Message, "Error MCast: Listener",

MessageBoxButtons.OK, MessageBoxIcon.Error);

MessageBox.Show("I'm Out of the Thread, this is not the Problem!", "PlotMgrlib");

} //End Class MCast