viewsheet location revit api
BoundingBoxXYZ xyzLocation = SelectedView.get_BoundingBox( m_Doc.ActiveView ); // get the outline max and min XYZ ptMaxOutline = new XYZ( CorrespondingView.Outline.Max.U, CorrespondingView.Outline.Max.V, 0 ); // get the view's origin point's // coordinates in current view sheet. UV ptSourceViewOriginInSheet = new UV( xyzLocation.Max.X - ptMaxOutline.X, xyzLocation.Max.Y - ptMaxOutline.Y );