How does a Silverlight application ask the browser what domain its being served up from?
UPDATE:
Make sure if your class doesn't already have this using statement add it at the top your class. This will help you on some of the examples you'll see online. It confused me for a bit.
using System.Windows.Browser;
Best Answer
How about HtmlDocument.DocumentUri? That'd get you what you need. Page about browser interop here.