Introduction - If you have any usage issues, please Google them yourself
First, create a new project to select the solutions- the blank program Secondly add an item to select the class library named the MOD data model layer to add an item to select the class library named DAL data access layer and then add a class library project named Select name BLL business logic layer added last DAL and then right-click the selected dependent the MOD also add reference selected project select MOD Right MOD DAL add a reference to the last web references MOD DAL BLL BLL choose to rely so we build a good environment and then start coding test a web application Note DAL/DBHelper.cs database physical path modify and compile the default login account/password: 51aspx/51aspx