In addition, you may find this article helpful. While it doesn't discuss NET, some of what it says applies.
http://management.cadalyst.com/cadman/Harry%27s+Code+Class+Newsletter+%28Archives%29/Harrys-Code-Class-September-2007/ArticleStandard/Article/detail/460433?contextCategoryId=39808
" What could be done by Lisp that can't be done with .Net ?" This is a little backwards. Net can do much more, but lisp can be more concise in some cases. While lisp is best at scripting existing acad commands, NET offers closer integration with acad.
To evaluate whether something is feasable or not, at a minimun, you need a summary of what it is capable of and your cost to attain it. You might try msdn.com and look at the visual studio home page to get an overview of NET. As far as NET in acad goes, you could summarize by saying that acad's NET api is a wrapper for the ARX classes. Which means that you have greater access to acad than lisp, but at a greater cost. Due to its complexity, it takes a long time to learn.
Ed
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