This the best I have seen the .Net three layer architecture examples (with source code ), for want to learn .Net and a three layer architecture, it is a must. As long as you take this example of learning, that your three layer architecture certainly no problem. Welcome everyone to download the learning

用户注册例子(最终版三层模式+单元测试)\UserRegister\UserRegister.sln
.....................................\............\UserRegister.suo
.....................................\............\....TestProject\Properties\AssemblyInfo.cs
.....................................\............\...............\Properties
.....................................\............\...............\UserTestProject.csproj
.....................................\............\...............\bin\Debug\MbUnit.AddIn.dll
.....................................\............\...............\...\.....\MbUnit.Framework.2.0.dll
.....................................\............\...............\...\.....\MbUnit.Framework.dll
.....................................\............\...............\...\.....\QuickGraph.dll
.....................................\............\...............\...\.....\User.DataAccess.dll
.....................................\............\...............\...\.....\User.Model.dll
.....................................\............\...............\...\.....\TestFu.dll
.....................................\............\...............\...\.....\User.SystemConfiguration.dll
.....................................\............\...............\...\.....\QuickGraph.Algorithms.dll
.....................................\............\...............\...\.....\Refly.dll
.....................................\............\...............\...\.....\User.Model.pdb
.....................................\............\...............\...\.....\TestFu.xml
.....................................\............\...............\...\.....\QuickGraph.xml
.....................................\............\...............\...\.....\User.DataAccess.pdb
.....................................\............\...............\...\.....\User.SystemConfiguration.pdb
.....................................\............\...............\...\.....\QuickGraph.Algorithms.xml
.....................................\............\...............\...\.....\MbUnit.Framework.2.0.xml
.....................................\............\...............\...\.....\MbUnit.Framework.xml
.....................................\............\...............\...\.....\Refly.xml
.....................................\............\...............\...\.....\User.UserTestProject.dll
.....................................\............\...............\...\.....\User.UserTestProject.pdb
.....................................\............\...............\...\.....\User.UserTestProject.dll.config
.....................................\............\...............\...\Debug
.....................................\............\...............\bin
.....................................\............\...............\obj\Debug\TempPE
.....................................\............\...............\...\.....\ResolveAssemblyReference.cache
.....................................\............\...............\...\.....\User.UserTestProject.pdb
.....................................\............\...............\...\.....\User.UserTestProject.dll
.....................................\............\...............\...\Debug
.....................................\............\...............\...\UserTestProject.csproj.FileList.txt
.....................................\............\...............\obj
.....................................\............\...............\AuthoringTests.txt
.....................................\............\...............\UserTest.cs
.....................................\............\...............\App.config
.....................................\............\UserTestProject
.....................................\............\localtestrun.testrunconfig
.....................................\............\UserRegister.vsmdi
.....................................\UserRegister
.....................................\WebUI\App_Data\Register.mdf
.....................................\.....\........\Register_log.LDF
.....................................\.....\App_Data
.....................................\.....\Default.aspx
.......

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