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

On the Tools menu, click Options.

In the Options dialog box, expand Text Editor , and then complete one of the following tasks:

• For Visual Basic, expand Basic, click VB Specific, and then select or clear Enable highlighting of references and keywords.
• For C#, expand C#, click Advanced, and then select or clear Highlight references to symbol under cursor.

From: msdn