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I need to upgrade the autocad 2005 which is coded in LISP to Autocad 2014 using .net and Object ARX 2014.What should be my approach towards it.
Thanks in advance
Well, Lisp API and .Net/ARX are completely different. The workflow might be similar but you will need to rewrite your code.
You can start by the AutoCAD developer center that contains numerous resources for APIs:
http://usa.autodesk.com/adsk/servlet/index?id=1911627&siteID=123112
The ADN DevBlog also has useful articles:
http://adndevblog.typepad.com/autocad/
I hope it helps,
Philippe.