I\'m working on a Silverlight project with the WCF RIA Services beta. I\'m using the BlahDomainService.metadata.cs file to validate a field by adding validation attributes, e.g
Everything was okay except that I hadn't set the AccessModifier for the .resx to Public. Once I'd done that and Rebuilt All, it worked.
You also have add a resources (.resx) as a link in the client silverlight project for the web project. See template Silverlight Bussiness Application in VS 2010. It has a very good sample.