How to stop thread??

Question

I'm doing a Network project . I used a function to listen to clients and maked it as a thread. The main problem is when I closed the application,the main window closes and the application runs in background.I cannot close the application Even from the Task Manager.
Code used
private void MainForm_Load(object sender, EventArgs e)
{
th = new Thread(new ThreadStart(listen));
th.Start();

}

private void MainForm_FormClosing(object sender, FormClosingEventArgs e)
{

shut=1;
th.Abort();
}

public void listen()
{
ss.Bind(new IPEndPoint(IPAddress.Any, 4000));
ss.Listen(-1);

while (shut==0)
{
cs = ss.Accept();
c1 = 0;
mysocket[i] = cs;
i++;
clientsock = cs;
ThreadPool.QueueUserWorkItem(new WaitCallback(listensend), clientsock);
}
}

Also the socket string used is
Socket ss = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);

Can I close the Application forcibly?

Sunny Chen · Answer

1. Declare your shut variable as volatile 2. Shutdown your Socket connection after the thread terminates: shut=1; th.Join(); ss.Close();

Brandon Lewis · Answer

Just call Socket.Close() and it will close the socket and if its currently blocking (awaiting data) it will throw a SocketException which you can catch in a try - catch and ignore based on the error code.

aggil antony · Answer

Can u tell How to stop the socket???

Brandon Lewis · Answer

You will need to close the socket to kill the tread since the socket is on a blocking operation. This will throw an exception though. However you can catch this SocketException in a try - catch block and ignore it.