一个简单的三层架构例子，有工厂模式，可以帮助了解编写三层架构程序。- you can use the factory to write a process after reading the process.And you will know it is so easy to write a similar process.

Program Descr iption: ASP.NET 2.0 + SQL SERVER 2000 3,300.00 the ACCESS development. The BLL: Business Layer DALFactory: data factory Utility: Data Access Layer IDAL: the interface layer Model: Data Physical Layer SQLServerDAL: SQL Data