how to make callback

[jmcilhinney]

You don't invoke RunServer because that will just try to run EVERYTHING again. You write a method just like my SetText method (or in your case AppendText might be better) and you call that. It will create the delegate if required.

[RaymondMR2]

I made the method AppendText

private Delegate Sub AppendTextDelegate(ByVal text As String)
  Private Sub ApendText(ByVal text As String)
        If Me.txtDisplay.InvokeRequired Then
            Me.txtDisplay.Invoke(New AppendTextDelegate(AddressOf ApendText), text)
        Else
            Me.txtDisplay.Text = text
        End If
    End Sub

i actually tried this before your post, then where do i call this in the while loop. i know the error is at

txtDisplay.Text = "Waiting for conenction" & vbCrLf

sorry about this, im new to VB.NET