In the server side form, I have two buttons one is "Start Listening",the other is "Stop Listening"..
Now the problem is :
when I re-enter the "Start Listening" button after stop listening ,i will get this error : the same port can only be used once,
but i 've stop the Tcplistener after I enter the "Stop Listening" button,
i don't know why
who can help me
thanks