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arcobjects update mdb file geometry

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Hi,
I have vb.net code that works fine and updates geometry of a polyline shapefile.
What do I need to change/add to the code in order to perform similar operations on personal geodatabase *.mdb file?
Database Name= AllFeatures.mdb
Feature Dataset=LineFeatures
Feature Class = Lines

When I run this program on a mdb personal geodatabase the "Feature.Store" line of code does not work and throws an error "Items not found in this collection"
Any help or hints much appreciated.

Code:

  Do While Not id = -1
                    pFeature = pFLayer.FeatureClass.GetFeature(id)

                    pPolyline = pFeature.Shape
                    pPointColl = pPolyline

                    For lPnt = 0 To (pPointColl.PointCount - 1)
                        Dim newPoint As IPoint = SetZValueOnPoint(pPointColl.Point(lPnt), Convert.ToDouble(txtZValue.Text))
                        pPointColl.UpdatePoint(lPnt, newPoint)
                    Next
                    pFeature.Shape = pPointColl
                    pFeature.Store()


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