Show Indentation Lines in Visual Studio 2010

"Wouldn’t it be great to have a visual aid to help you read your code and verify that is aligned properly and the tags match?"

Displays indent and page width guides in Visual Studio text editor windows.
Guides can be displayed at the indent specified in your settings, regardless of tabs or spaces, or wherever text has been indented to. Page width markers can be displayed at a fixed location and will change color when code extends past them.
There are three styles of guides: solid, dotted and dashed, available in thin and thick varieties and customizable color. The default is dotted grey, as shown in the image. Each indent level can have a different style and color.
Guides can be shown and customized for any language in Visual Studio. The extension understands whitespace characters, not code.

No guides after upgrading?

Ensure this menu is checked:

 (There is a bug where Visual Studio will reset some settings on upgrade.)

Indent Guides

 

See Indent Guides in the Visual Studio Gallery for the latest stable release and end-user QA. Visual Studio 2010 now has a separate download available from Indent Guides v14.

The screenshots are from Indent Guides v14.

If you are interested in downloading the source for this project, you can access it from the Source Code tab above. Downloading the code associated with the latest release is strongly recommended; there is no guarantee that any other commit either works or is complete. (You can download a particular changeset without Mercurial by clicking on the revision number before the Download link.)
 

 

Theo indentguide.codeplex.com