http://blogs.msdn.com/b/vsdata/archive/2009/12/03/live-intellisense-in-wcf-ria-services-for-vs2010.aspxLive IntelliSense is one of the new features added into WCF RIA Services PDC release on VS2010. It enables no-build experience to get IntelliSense support on the client project for business objects defined in the server project. As we know, IntelliSenseen-USTelligent Evolution Platform Developer Build (Build: 5.6.50428.7875)