Hi all,

I have an application that accepts connections on a given port using a thread. I'm trying to work out the best way to detect of a client has disconnected. I don't want to rely on a message from the client eg "quit" to notify my application a client has dropped off. Id like to be able to detect it in a smarter way, but just not sure how.

I have 2 main bits of code

Code:
    Private Sub RemoteClientListen()

        Dim myport = TCPListenPort

        listener = New System.Net.Sockets.TcpListener(System.Net.IPAddress.Any, myport) 'The TcpListener will listen for incoming connections        
        Try
            listener.Start() 'Start listening.        
        Catch excep As System.Net.Sockets.SocketException
            MessageBox.Show(excep.Message, excep.Source)
        End Try

        listenThread = New System.Threading.Thread(AddressOf DoListen) 'This thread will run the doListen method        
        listenThread.IsBackground = True 'Since we dont want this thread to keep on running after the application closes, we set isBackground to true.        
        listenThread.Start() 'Start executing doListen on the worker thread.    
        UpdateStatus("TCP Server - Active on port: " & myport)

    End Sub

    Private Sub DoListen()
        Try
            Dim incomingClient As System.Net.Sockets.TcpClient
            Do
                incomingClient = listener.AcceptTcpClient 'Accept the incoming connection. This is a blocking method so execution will halt here until someone tries to connect.            

                networkStream = incomingClient.GetStream()
                Dim ipEndPoint As IPEndPoint = incomingClient.Client.RemoteEndPoint
                ipClientAddress = ipEndPoint.Address

                Dim connClient As New ConnectedClient(incomingClient, Me, ipClientAddress.ToString) 'Create a new instance of ConnectedClient (check its constructor to see whats happening now).
                AddHandler connClient.dataReceived, AddressOf Me.MessageReceived
                connClient.Username = ipClientAddress.ToString

                AddClientToListBox(ipClientAddress.ToString)
                clients.Add(connClient) 'Adds the connected client to the list of connected clients.

                UpdateStatus("Client Connected:" & ipClientAddress.ToString)

            Loop

        Catch
        End Try
    End Sub
Greatly appreciate any assistance.

Thanks