Selection Set from model space BTR

[RobJG]

Im trying to get a selection of certain objects from the modelspace btr of a dwg im opening in code (not in the active autocad window) but failing horribly.

Can anyone point me in the right direction?

Heres a cut down version of code showing where im at until I get to the selection part.

Dim objDB As New Database(False, True)
objDB.ReadDwgFile(filePath, FileShare.Read, False, "")

Using trans As Transaction = objDB.TransactionManager.StartTransaction
   Dim bt As BlockTable = trans.GetObject(objDB.BlockTableId, OpenMode.ForRead, False)
   Dim btr As BlockTableRecord = trans.GetObject(bt(BlockTableRecord.ModelSpace), OpenMode.ForRead)          

End Using

 I've tried a few different things past this point but nothing seems to work.  Any advise/code snippets would be appreciated.

[Alexander.Rivilis]

Selection Set makes sense only with dwg-file opened in AutoCAD editor.

[RobJG]

Yeah, this has just occured to me too.

Currently working with the objectIDs in the btr now to see if I can do what I want.