Found an answer closer to home in the posts...http://forums.arcgis.com/threads/18708-Problem-selecting-features-from-a-Feature-Layerjust used a slightly different linq query: IEnumerable<Graphic> IEgraphic = from g in _CurrentEditFeatureLayer.Graphics where (g.Attributes[objId].Equals((int?)id)) && (id != null) select g; if (IEgraphic.Count() > 0) { Graphic graphic = IEgraphic.First(); // if polygon or line if (editor.EditVertices.CanExecute(graphic)) { _CurrentSelectedGraphic = graphic; editor.EditVertices.Execute(graphic);