How to enhance my Development Skill as asp.net c# developer.

No Shortcut! Learn/explore the technologies and most importantly share them. In my experience, i suggest try to be member of any ASP.Net forums you want, and spent some time to solve the problems that are raised in the forums. It will really improves a lot. Say for example, if you (try to) answer 10 questions, you are aware about 10 different problems with solutions, at most. I'm the one of the example for this. If you make this as a habit. You will find a difference at the earliest.

Hope this helps!