Screenshot

Question

I noticed some people can show the l开发者_StackOverflow社区eft bar as shown above.

How to do that?

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There's a very useful free add-on for Visual Studio called CodeRush Express which will do this.

http://community.devexpress.com/blogs/markmiller/archive/2009/06/25/coderush-xpress-for-c-and-visual-basic-2008.aspx (Scroll to the 'Structural Highlighting' bit to see a screenshot of it).

http://www.codekana.com/ is another add-on that does a similar thing.