K8047d.dll under VB.NET

I am having a similar problem with getting the .dll’s to work with vb.net

I am declaring the k8047d.dll in a similar fashion…

Public Declare Auto Sub LEDon Lib "k8047d.dll" ()

But when I call the function using…

LEDon()

The device does not respond, however I receive no compilation errors.

If anyone could help in these similar problems it would be appreciated.

Thanks in advance.