Compress Individual Files using YUI Compressor .Net

How can i compress individual css files using YUI build task (or otherwise). Scenario: I have

• Style.css,
• IFrame.css,
• Grid.css

I can compress and merge these files to main.min.css (no problem here, got a sample from yui on codeplex).

However, I also have a Contact.css that is only used on the contact page. How do I compress this file seperately from the others? i.e into contact.min.css

I am now using Cassette. The next VS will have this built in.