How do you consume an 'outbound message' with a .Net 4.0 ashx handler?

I think I am close, but I would like to consume the Salesforce Outbound Message from my workflow with .Net 4.0. Can someone share some code that will get me past this speedbump? The only code samples I see are with asmx pages and .Net 2.0! Argh! I'm still wrapping my head around the whole thing, so please respond accordingly. Thank you.