”RIA Services are an application design pattern that lives between ASP.NET and Silverlight in a multi-tier architecture. Inside RIA Services you can host application logic for data access control, queries, and other data operations. Integration with Silverlight components and controls allows for data validation and access control to automatically be made available to the client,” Allen explained. WCF RIA Services RC2 along with the WCF RIA Services Toolkit April 2010 come at almost a month since the release of the previous RC development milestone for the Services, and the March 2010 version of the Toolkit. “The update from the release candidate at this year’s MIX event includes bug fixes, improvements to tracing and debugging, and some minor feature enhancements. This release candidate also has a corresponding April update to the RIA Services toolkit,” Allen added.