It works both ways in 2010
It has to this way in 2011
h.SetHatchPattern(HatchPatternType.PreDefined, sHatch);
h.PatternAngle = (double)acadApp.GetSystemVariable("hpang");

The paperspace viewport always has the lowest objectid
and the first item in the paperspace block
using(Transaction tr = db.TransactionManager.StartTransaction())       
            {
                BlockTable bt = tr.GetObject(db.BlockTableId, OpenMode.ForRead) as BlockTable;
                BlockTableRecord PaperSpace = tr.GetObject(bt[BlockTableRecord.PaperSpace], OpenMode.ForRead) as BlockTableRecord;
                Viewport PaperSpaceVp=null;
                foreach(ObjectId id in PaperSpace)
                {
                    PaperSpaceVp = tr.GetObject(id, OpenMode.ForRead) as Viewport; 
                    break;
                }
                ed.WriteMessage(Environment.NewLine + PaperSpaceVp.Number.ToString());     
                tr.Commit();       
            }

In a program I'm writing, I change the UCS of the drawing.  I'm doing it all without commands, so to change the UCS back I have to create one if the current UCS is un-named.  If you dump a document, you will see something like ' ;   ActiveUCS = AutoCAD: Null object ID ' if the UCS is un-named, and I would like to return it to that, but I can't seem to figure out how to do it.  Right now I create a temporary UCS for both the current, and the one I will be using ( if I was smarter, than I would just rotate the items with a transformation matrix, based on the normal of the object I'm selecting ), and then delete them, but I can't delete the one that is current ( which I switch back to, which is the reason I can't delete it ).

Any help is appreciated.  The code has been done here before, but didn't work in my situation, so hence the rewrite.  Will post when this is figured out, if people don't mind me doing so.

Thanks in advance.

personally, I disabled the UAC.

i haven't checked, but what about Layout2?  Would it be #2 or 4? or is it Layout.Viewport.Number?

Thanks for the correction. 

Don't forget to protect your system. Wear a wrist band. 

Good catch.

Is the best way to distinguish the PaperSpace viewport from a "Floating Viewport" is the Viewport.Number

If so if safe to assume that for a PaperSpace Layout with one Floating Viewport

The Paperspace viewport  Viewport.Number = 1
And the  "Floating viewport" Viewport.Number = 2

Or if it has multiple floating viewports
The Paperspace viewport  Viewport.Number = 1
And the  "Floating viewport's" Viewport.Number >= 2

What makes them think "vulnerabilities per user" is a meaningful metric?