AutoCAD .NET :: Attribute Collection From A Non-placed Block

I need to get the Attribute Collection of a named block which is not been placed in the drawing, but it does exist

Dim paaltype As String
Dim acDoc As Document = Application.DocumentManager.MdiActiveDocument
Dim acCurDb As Database = acDoc.Database
Dim acDocEd As Editor = acDoc.Editor

Using acTrans As Transaction = acCurDb.TransactionManager.StartTransaction()
paaltype = "paal01"
Dim acBlkTbl As BlockTable
acBlkTbl = acTrans.GetObject(acCurDb.BlockTableId, OpenMode.ForRead)
If acBlkTbl.Has(paaltype) Then
‘block exist, how to get the attributecollection
End If
acTrans.Dispose()
End Using