Scott Mitchell为ASP.NET技术相当知名的作者，我个人的书架就好几本Mitchell的书，这些是他在MSDN发表的文章，为ASP.NET 2.0在3-tier开发做Step by Step的Tutorial，假如觉得PetShop 4.0太过抽象而无法理解3-tier开发的真意，建议一步一步跟着Mitchell的带领，进入3-tier开发的圣殿。这一系列的文章并还没写完，若随时有更新，我也会马上更新连结。
Tutorial 1: Creating a Data Access Layer
Tutorial 2: Creating a Business Logic Layer
Tutorial 3: Master Pages and Site Navigation
Tutorial 4: Displaying Data With the ObjectDataSource
Tutorial 5: Declarative Parameters
Tutorial 6: Programmatically Setting the ObjectDataSource's Parameter Values
Tutorial 7: Master/Detail Filtering With a DropDownList
Tutorial 8: Master/Detail Filtering With Two DropDownLists
Tutorial 9: Master/Detail Filtering Across Two Pages
Tutorial 10: Master/Detail Using a Selectable Master GridView with a Details DetailView
