Problem disconnecting .NET TCP client

Hello, here's my code to disconnect a TCP client connected to a TCP server:

    Public Function Disconnect() As Boolean

        ptr_ClientSocket.Shutdown(Net.Sockets.SocketShutdown.Both)
        ptr_ClientSocket.BeginDisconnect(True, New AsyncCallback(AddressOf DisconnectCallback), Nothing)
        SetState(eState.Disconnecting)

        Return True

    End Function

    Private Sub DisconnectCallback(ByVal ar As IAsyncResult)

        ptr_ClientSocket.EndDisconnect(ar)
        SetState(eState.Ready)

    End Sub

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The weird part is that my DisconnectCallback never fires, and it stalls in 'Disconnecting' state.  Does this require some action on the server side?  What's the right way to do this?

Thanks for any help.
RonMexicoAsked:
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David Johnson, CD, MVPOwnerCommented:
clientSocket.Close()
clientSocket.Client.Dispose()

is how I deal with it also on the server you should have a sort of a heartbeat that checks the client connection status by sending 1 byte if it fails then the client is disconnected otherwise it is connected.
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