Started using AutoCAD as CAD support company support staff in 1989, yes 1989 - version 10. I was immediately programming all manner of LISP macros, from math to geometry to database integration (those days - DBF). Then evolved with Autodesk automation … VBA then dot net. Have been coding C# dot net for many years now. Started to provide Civil 3D macros (DLL) from about 2008 to present. Now I need to re-evolve with Dynamo.