The three-tier instance (C#) is actually three layers to understand very simple, is divided into different responsibilities to different layers in order to achieve the objective of decoupling. The purpose of stratification is to allow the program to become high cohesion, low coupling, makes the code more flexible, easy to expand, make the code more ease of use, and so on.

LoginC\BLL\bin\Debug\BLL.dll
......\...\...\.....\BLL.pdb
......\...\...\.....\DAL.dll
......\...\...\.....\DAL.pdb
......\...\...\.....\Entity.dll
......\...\...\.....\Entity.pdb
......\...\BLL.csproj
......\...\LoginBLL.cs
......\...\obj\Debug\BLL.csproj.FileListAbsolute.txt
......\...\...\.....\BLL.dll
......\...\...\.....\BLL.pdb
......\...\...\.....\DesignTimeResolveAssemblyReferencesInput.cache
......\...\...\.....\ResolveAssemblyReference.cache
......\...\...\.....\TempPE\studentDataSet.Designer.cs.dll
......\...\...\.....\......\studentDataSet1.Designer.cs.dll
......\...\Properties\AssemblyInfo.cs
......\...\..........\Settings.Designer.cs
......\...\..........\Settings.settings
......\DAL\bin\Debug\DAL.dll
......\...\...\.....\DAL.pdb
......\...\...\.....\Entity.dll
......\...\...\.....\Entity.pdb
......\...\DAL.csproj
......\...\obj\Debug\DAL.csproj.FileListAbsolute.txt
......\...\...\.....\DAL.dll
......\...\...\.....\DAL.pdb
......\...\...\.....\DesignTimeResolveAssemblyReferencesInput.cache
......\...\...\.....\ResolveAssemblyReference.cache
......\...\Properties\AssemblyInfo.cs
......\...\UserDAL.cs
......\Entity\bin\Debug\Entity.dll
......\......\...\.....\Entity.pdb
......\......\Entity.csproj
......\......\obj\Debug\DesignTimeResolveAssemblyReferencesInput.cache
......\......\...\.....\Entity.csproj.FileListAbsolute.txt
......\......\...\.....\Entity.dll
......\......\...\.....\Entity.pdb
......\......\Properties\AssemblyInfo.cs
......\......\User.cs
......\Login\bin\Debug\BLL.dll
......\.....\...\.....\BLL.pdb
......\.....\...\.....\DAL.dll
......\.....\...\.....\DAL.pdb
......\.....\...\.....\Entity.dll
......\.....\...\.....\Entity.pdb
......\.....\...\.....\Login.exe
......\.....\...\.....\Login.pdb
......\.....\...\.....\Login.vshost.exe
......\.....\...\.....\Login.vshost.exe.manifest
......\.....\Login.cs
......\.....\Login.csproj
......\.....\Login.csproj.user
......\.....\Login.Designer.cs
......\.....\Login.resx
......\.....\obj\x86\Debug\DesignTimeResolveAssemblyReferences.cache
......\.....\...\...\.....\DesignTimeResolveAssemblyReferencesInput.cache
......\.....\...\...\.....\GenerateResource.read.1.tlog
......\.....\...\...\.....\GenerateResource.write.1.tlog
......\.....\...\...\.....\Login.csproj.FileListAbsolute.txt
......\.....\...\...\.....\Login.exe
......\.....\...\...\.....\Login.Login.resources
......\.....\...\...\.....\Login.pdb
......\.....\...\...\.....\Login.Properties.Resources.resources
......\.....\...\...\.....\ResolveAssemblyReference.cache
......\.....\Program.cs
......\.....\...perties\AssemblyInfo.cs
......\.....\..........\Resources.Designer.cs
......\.....\..........\Resources.resx
......\.....\..........\Settings.Designer.cs
......\.....\..........\Settings.settings
......\Login.sln
......\Login.suo
......\说明C.txt
......\Login\obj\x86\Debug\TempPE
......\BLL\obj\Debug\TempPE
......\DAL\obj\Debug\TempPE
......\Entity\obj\Debug\TempPE
......\Login\obj\x86\Debug
......\BLL\bin\Debug
......\...\...\Release
......\...\obj\Debug
......\DAL\bin\Debug
......\...\...\Release
......\...\obj\Debug
......\Entity\bin\Debug
......\......\...\Release
......\......\obj\Debug
......\Login\bin\Debug
......\.....\...\Release
......\.....\obj\x86
......\BLL\bin
......\...\obj
......\...\Properties
......\DAL\bin
......\...\obj
......\...\Properties
......\Entity\bin
......\......\obj
......\......\Properties
......\Login\bin

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