For those of you who have not know about Microsoft’s solution to the N-Tier system, you should hurry up and learn more about it. Its already been months old with two public releases (Preview versions).
Microsoft calls it .NET RIA services. What the hell is it and how is it different from traditional 2-tier and 3-tier systems?
Microsoft .NET RIA Services simplifies the traditional n-tier application pattern by bringing together the ASP.NET and Silverlight platforms. The 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.
I have posted some links below to help get familiarize with .NET RIA services.
Installing July 2009 preview: Download the installer from here. (Prerequisites: Visual Studio 2008SP1 or Visual Web Developer SP1 and Silverlight 3.0 Runtime,SDK and Tools. You are required to uninstall March / May 2009 Preview before installing the newer version.
More information/tutorials on it can be found at