Hello hello,
It is quite cumbersome when your intellisense stops working. As a .net developer i know what it means when you are formatting your views.
Problem: Intellisense not working in Visual Studio
Solution:
Go to following path on your machine:
C:\Users\USERNAME\AppData\Roaming\Microsoft\VisualStudio\10.0
and delete all stuff. YES!! i said delete that files and you are done.
I think this information will help you to get started with Intellisense. If you need more help or clarification - Add comment. -Cheers