There is a number of good resources in CodeProject. First, please the four articles references by these search results:
http://www.codeproject.com/search.aspx?doctypeid=1&q=%22vb.net%22+%22parallel+port%22[
^].
I would advice not to limit search by "VB.NET" as I demonstrated above. If you replace "VB.NET" with "C#", there will be 16 articles:
http://www.codeproject.com/search.aspx?doctypeid=1&q=%22C%23%22+%22parallel+port%22[
^].
Well, this is natural: people use standard C#, a .NET flagship, more seriously. And you won't have any problem using C# assembly in your code. Anyway, a VB.NET developer just has to understand at least some C#.
Probably, you already have enough information. However, I would not limit the search by language or platform at all. Even it this is a native Windows code, you can always use it in your .NET project using P/Invoke (
http://en.wikipedia.org/wiki/P/Invoke[
^]).
—SA