business-application

I've been trying to run the Silverlight Business Application template but it fails when I try to register. I have SQL Express with an MSSQLSERVER instance and I've defined the standard aspnetdb created. The error is: Submit operation failed. Unable to connect to SQL server database. at System.Web.DomainServices.ReflectionDomainServiceDescriptionProvider.ReflectionDomainOperationEntry.Invoke(DomainService domainService, Object[] parameters) at System.Web.DomainServices.DomainService.InvokeDomainOperationEntry(DomainOperationEntry domainOperationEntry, Object[] parameters, ChangeSetEntry

I'm pretty familiar with a lot of the ins and outs of full fledged WPF client applications. I know that WPF client applications supports the full .NET Framework 3.5, allows for hardware acceleration of 2D and 3D graphics, theming, templating, styling, triggers, the works. What I'm not clear about is what features, and/or niceties are either present or lacking in XBAP and Silverlight applications. I've heard that XBAPs are intrinsically limited in certain ways due to security concerns, but that's about it. I know for a fact that WPF is robust enough to be used in full-scale business