Asyncronous socket Error client disconnet

[tokneneng]

Hi please help I've already make asynchronous socket work however I"m having issue when client disconnect below is the error code and In the code I highlight were the error trigger.

Error:
NullReferenceException was unhandled by user code
Object reference not set to an instance of an object.

    Private Sub DisplayIdle(ByVal sender As Object, ByVal e As System.Timers.ElapsedEventArgs) Handles IdleTimer.Elapsed
        For Each Key As String In __ItemList.GetKeyList
            Dim Item As ListViewItem = __ItemList(Key)
            Dim intIdle As Integer = (oServer.Connections(Key).IdleTime \ 1000)
            If (intIdle.ToString <> Item.SubItems(2).Text) Then
                Item.SubItems(2).Text = intIdle.ToString
            End If
        Next
    End Sub

I attached the code of asynchronous socket I used for client and server, I have one more issue when I send message on server or client it disconnect the connection between server and client. The author of this code is Paulo S Silva Jr. I convert it to vb.net 2010 to make it work however I has stock with disconnect error when receiving and sending string.

Can anyone help me please.

[jmcilhinney]

When a NullReferenceException is thrown is generally means that something before a dot is Nothing. In your case, that means either oServer or oServer.Connections(Key). Find out which and then find out why no object was assigned.