Microsoft WCF RIA Services 1.0 SP2

Microsoft WCF RIA Services was developed to be an framework that provides a pattern to write application logic that runs on the mid-tier and controls access to data for queries, changes and custom operations.
Microsoft WCF RIA Services simplifies the traditional n-tier application pattern by bringing together the ASP.NET and Silverlight platforms. RIA Services provides a pattern to write application logic that runs on the mid-tier and controls access to data for queries, changes and custom operations.
It also provides end-to-end support for common tasks such as data validation, authentication and roles by integrating with Silverlight components on the client and ASP.NET on the mid-tier.System requirementsVisual Studio 2010 RC or Visual Studio 2008 SP1 or Visual Web Developer Express 2008 SP1