If you use Silverlight and you are trying to look at why service calls are failing, you will want to use Fiddler to see what is actually going on. Is the request going through, is the server returning an error. Since Silverlight always gives the same crappy error, Endpoint not found or something similair, then looking at the actual raw request responses is pretty helpful.
So you turn on Fiddler, but no requests appear? Well, some strange issues, with a long explanation, about using localhost don’t get logged into Fiddler. The trick is to rename your service references to localhost. Yes, simply add the .
Just make sure you type that URL the same way into your browser, otherwise you get a cross domain call issue. That is the subject for the next quick post.