How to get Visual Studio 2010 to highlight instances of a variable

Question

I\'m new using vs2010 I\'ve read that when you click on a variable its suppose to highlight all the instances of that variable in that file and highlight red or show an error as

Answer 1

In case someone else bumps into this, much like I did looking for the same thing, Visual Studio Express editions don't support extensions, which means no selection highlighting in C++. More importantly, if you get an error trying to install an extension, don't worry, or rather, worry for other reasons, it's normal.

nuGet in 2012 is the only exception I've bumped into, but personally I (and I know many like me) have to use 2010.