Examples based on the idea of a three-tier system will be running through them, let you quickly understand the essence of the three-tier structure

三层架构项目参考
................\200508140101069108
................\..................\ThreeLayer
................\..................\..........\admin_Index.aspx
................\..................\..........\admin_Index.aspx.cs
................\..................\..........\admin_Index.aspx.resx
................\..................\..........\Admin_Left.aspx
................\..................\..........\Admin_Left.aspx.cs
................\..................\..........\admin_Left.aspx.resx
................\..................\..........\App_Code
................\..................\..........\........\AssemblyInfo.cs
................\..................\..........\........\BLL
................\..................\..........\........\...\Sys
................\..................\..........\........\...\...\Limit.cs
................\..................\..........\........\...\...\Message.cs
................\..................\..........\........\...\...\User.cs
................\..................\..........\........\DAL
................\..................\..........\........\...\CommData
................\..................\..........\........\...\........\Data.cs
................\..................\..........\........\...\Sys
................\..................\..........\........\...\...\Limit.cs
................\..................\..........\........\...\...\Message.cs
................\..................\..........\........\...\...\User.cs
................\..................\..........\........\Global.asax.cs
................\..................\..........\........\Migrated
................\..................\..........\........\........\web
................\..................\..........\........\........\...\modules
................\..................\..........\........\........\...\.......\Stub_del_aspx_cs.cs
................\..................\..........\........\Model
................\..................\..........\........\.....\Sys
................\..................\..........\........\.....\...\Limit.cs
................\..................\..........\........\.....\...\Message.cs
................\..................\..........\........\.....\...\User.cs
................\..................\..........\........\Web
................\..................\..........\........\...\Components
................\..................\..........\........\...\..........\Config.cs
................\..................\..........\Backup
................\..................\..........\......\ThreeLayer
................\..................\..........\......\ThreeLayer.sln
................\..................\..........\bin
................\..................\..........\...\AspNetPager.dll
................\..................\..........\...\EeekSoft.Web.PopupWin.dll
................\..................\..........\...\KJavaWeb.pdb
................\..................\..........\...\KM_Com.dll
................\..................\..........\...\KM_Com.pdb
................\..................\..........\...\WFNetCtrl.dll
................\..................\..........\BLL
................\..................\..........\...\Sys
................\..................\..........\ConversionReport.txt
................\..................\..........\DAL
................\..................\..........\...\CommData
................\..................\..........\...\Sys
................\..................\..........\DataBase
................\..................\..........\........\ThreeLayer.bak
................\..................\..........\Default.aspx
................\..................\..........\Default.aspx.cs
................\..................\..........\Default.aspx.resx
................\..................\..........\Global.asax
................\..................\..........\Global.asax.resx
................\..................\..........\Model
................\..................\..........\.....\Sys
................\..................\..........\ThreeLayer.sln
................\..................\..........\UpgradeLog.XML
................\..................\........

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