C# an example of the three-tier system, a good interpretation of the three-tier structure, suitable for novice View, dal

2012102411429\终版三层架构\class7_3\class7_3.sln
.............\............\........\class7_3.suo
.............\............\........\DBUtility\DBUtility.csproj
.............\............\........\.........\obj\Debug\DBUtility.pdb
.............\............\........\.........\...\.....\DBUtility.dll
.............\............\........\.........\...\DBUtility.csproj.FileList.txt
.............\............\........\.........\bin\Debug\DBUtility.dll
.............\............\........\.........\...\.....\DBUtility.pdb
.............\............\........\.........\Properties\AssemblyInfo.cs
.............\............\........\.........\DbHelper.cs
.............\............\........\.........\ConnStr.cs
.............\............\........\Model\Model.csproj
.............\............\........\.....\obj\Debug\Model.pdb
.............\............\........\.....\...\.....\Model.dll
.............\............\........\.....\...\Model.csproj.FileList.txt
.............\............\........\.....\bin\Debug\Model.dll
.............\............\........\.....\...\.....\Model.pdb
.............\............\........\.....\Properties\AssemblyInfo.cs
.............\............\........\.....\Departments.cs
.............\............\........\.....\Students.cs
.............\............\........\BLL\BLL.csproj
.............\............\........\...\obj\Debug\BLL.pdb
.............\............\........\...\...\.....\BLL.dll
.............\............\........\...\...\.....\ResolveAssemblyReference.cache
.............\............\........\...\...\BLL.csproj.FileList.txt
.............\............\........\...\bin\Debug\DAL.dll
.............\............\........\...\...\.....\Model.dll
.............\............\........\...\...\.....\DBUtility.dll
.............\............\........\...\...\.....\DBUtility.pdb
.............\............\........\...\...\.....\Model.pdb
.............\............\........\...\...\.....\DAL.pdb
.............\............\........\...\...\.....\BLL.dll
.............\............\........\...\...\.....\BLL.pdb
.............\............\........\...\Properties\AssemblyInfo.cs
.............\............\........\...\Departments.cs
.............\............\........\...\Students.cs
.............\............\........\DAL\DAL.csproj
.............\............\........\...\obj\Debug\DAL.pdb
.............\............\........\...\...\.....\DAL.dll
.............\............\........\...\...\.....\ResolveAssemblyReference.cache
.............\............\........\...\...\DAL.csproj.FileList.txt
.............\............\........\...\bin\Debug\DBUtility.dll
.............\............\........\...\...\.....\Model.dll
.............\............\........\...\...\.....\DBUtility.pdb
.............\............\........\...\...\.....\Model.pdb
.............\............\........\...\...\.....\DAL.dll
.............\............\........\...\...\.....\DAL.pdb
.............\............\........\...\Properties\AssemblyInfo.cs
.............\............\........\...\Departments.cs
.............\............\........\...\Students.cs
.............\............\........\class7_3\class7_3.csproj
.............\............\........\........\Form1.Designer.cs
.............\............\........\........\Form1.resx
.............\............\........\........\Form2.Designer.cs
.............\............\........\........\Form2.resx
.............\............\........\........\obj\Debug\TempPE\Properties.Resources.Designer.cs.dll
.............\............\........\........\...\.....\class7_3.Form1.resources
.............\............\........\........\...\.....\class7_3.Form2.resources
.............\............\........\........\...\.....\class7_3.Properties.Resources.resources
.............\............\........\........\...\.....\class7_3.exe
.............\............\........\........\...\.....\ResolveAssemblyReference.cache
.............\............\........\........\...\.....\class7_3.Form3.resources
.............\............\........\........\...\.....\class7_3.MainForm.resources
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