您可能会发现这个Firefox扩充功能很有用：http://www.sitepoint.com/dustmeselectors/

My project has collected CSS entropy (unused classes) during its course of development.

Now in order to keep the CSS file small, I want to remove all unused CSS references. But doing that manually involves searching for each class in the entire project. That takes time.

Do you know of any way/tool which I can adopt to find out which CSS classes are no longer used in my project, and remove it?

I am programming on ASP.NET. Visual Studio.

You might find this Firefox extension useful: http://www.sitepoint.com/dustmeselectors/