Excellent resource on 3-tiered data architecture with ASP.NET 2.0http://www.fuzzydev.com/blogs/dotnet/archive/2006/06/25/three_tiered_data_architecture_with_ASPNET2.aspxScott Mitchell has put together an awesome tutorial on building and using 3-tiered date architecture  with ASP.Net 2.0 It's available here The flow of the tutorial is excellent, you can also download the tutorials in pdf format. C# Tutorial in PDFen-USCommunityServer 2.0 (Build: 60404.2676)