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

If you are using VS2013 the following extension would solve this

https://visualstudiogallery.msdn.microsoft.com/df093e9f-3e74-41c5-aeec-6371436423c5