Line Counter Visual Studio add-in;

Install Directions:
-close visual studio
-download the ‘Installer’ from the website
-run as ‘yourself’ and let it install
-open visual studio
---select menu item: Tools
---select Add-in Manager
---click the checkbox beside the line counter add-in (and weather or not you want it started on startup)
---press ok
-a new line counter window will appear; select ‘recalculate’ when you have a solution/project open
-it looks like it supports multiple languages

http://www.codeproject.com/csharp/LineCounterAddin.asp