AutoCAD .NET :: Setting PS Viewport Named View

I have code that has the user select a viewport.  I then need to set the selected viewport to an existing view, but I cannot find any exampes of this.

I have the viewport, but how do I get the ViewPortTable/ViewPortTableRecord from it?

Do I need to set the view in the ViewPortTableRecord od the ViewTableRecord?

No problems to this point...
 
'Code snipIf acPrmpt_res.Status = PromptStatus.OK Then
Dim acVPort As Viewport = Nothing
Dim acViewTbl As ViewTable
Dim acViewTblrec As ViewTableRecord
[Code] ........