A typical three-tier structure, it is easy reuse, it is very easy to learn

Shjttz.GJJD(0913)\BLL\bin\Debug\Shjttz.GJJD.BLL.dll
.................\...\...\.....\Shjttz.GJJD.BLL.pdb
.................\...\...\.....\Shjttz.GJJD.DALFactory.dll
.................\...\...\.....\Shjttz.GJJD.DALFactory.pdb
.................\...\...\.....\Shjttz.GJJD.IDAL.dll
.................\...\...\.....\Shjttz.GJJD.IDAL.pdb
.................\...\...\.....\Shjttz.GJJD.Model.dll
.................\...\...\.....\Shjttz.GJJD.Model.pdb
.................\...\...\.....\vssver.scc
.................\...\BLL.csproj
.................\...\JCDW.cs
.................\...\JCXL.cs
.................\...\JCXLZD.cs
.................\...\JCZD.cs
.................\...\Login.cs
.................\...\obj\BLL.csproj.FileList.txt
.................\...\...\Debug\Refactor\Shjttz.GJJD.BLL.dll
.................\...\...\.....\ResolveAssemblyReference.cache
.................\...\...\.....\Shjttz.GJJD.BLL.dll
.................\...\...\.....\Shjttz.GJJD.BLL.pdb
.................\...\...\.....\vssver.scc
.................\...\...\vssver.scc
.................\...\Properties\AssemblyInfo.cs
.................\...\..........\vssver.scc
.................\...\vssver.scc
.................\DALFactory\bin\Debug\Shjttz.GJJD.DALFactory.dll
.................\..........\...\.....\Shjttz.GJJD.DALFactory.pdb
.................\..........\...\.....\Shjttz.GJJD.IDAL.dll
.................\..........\...\.....\Shjttz.GJJD.IDAL.pdb
.................\..........\...\.....\Shjttz.GJJD.Model.dll
.................\..........\...\.....\Shjttz.GJJD.Model.pdb
.................\..........\...\.....\vssver.scc
.................\..........\DALFactory.csproj
.................\..........\DataAccess.cs
.................\..........\obj\DALFactory.csproj.FileList.txt
.................\..........\...\.ebug\Refactor\Shjttz.GJJD.DALFactory.dll
.................\..........\...\.....\ResolveAssemblyReference.cache
.................\..........\...\.....\Shjttz.GJJD.DALFactory.dll
.................\..........\...\.....\Shjttz.GJJD.DALFactory.pdb
.................\..........\...\.....\vssver.scc
.................\..........\...\vssver.scc
.................\..........\Properties\AssemblyInfo.cs
.................\..........\..........\vssver.scc
.................\..........\vssver.scc
.................\.BUtility\bin\Debug\Shjttz.GJJD.DBUtility.dll
.................\.........\...\.....\Shjttz.GJJD.DBUtility.pdb
.................\.........\...\.....\vssver.scc
.................\.........\DBUtility.csproj
.................\.........\obj\DBUtility.csproj.FileList.txt
.................\.........\...\.ebug\Refactor\Shjttz.GJJD.DBUtility.dll
.................\.........\...\.....\Shjttz.GJJD.DBUtility.dll
.................\.........\...\.....\Shjttz.GJJD.DBUtility.pdb
.................\.........\...\.....\vssver.scc
.................\.........\...\vssver.scc
.................\.........\Properties\AssemblyInfo.cs
.................\.........\..........\vssver.scc
.................\.........\SQLHelper.cs
.................\.........\vssver.scc
.................\IDAL\bin\Debug\Shjttz.GJJD.IDAL.dll
.................\....\...\.....\Shjttz.GJJD.IDAL.pdb
.................\....\...\.....\Shjttz.GJJD.Model.dll
.................\....\...\.....\Shjttz.GJJD.Model.pdb
.................\....\...\.....\vssver.scc
.................\....\IDAL.csproj
.................\....\IJCDW.cs
.................\....\IJCXL.cs
.................\....\IJCXLZD.cs
.................\....\IJCZD.cs
.................\....\ILogin.cs
.................\....\obj\Debug\Refactor\Shjttz.GJJD.IDAL.dll
.................\....\...\.....\ResolveAssemblyReference.cache
.................\....\...\.....\Shjttz.GJJD.IDAL.dll
.................\....\...\.....\Shjttz.GJJD.IDAL.pdb
.................\....\...\.....\vssver.scc
.................\....\...\IDAL.csproj.FileList.txt
.................\....\...\vssver.scc
.................\....\Properties\AssemblyInfo.cs
.................\....\..........\vssver.scc
.................\....\vssver.scc
.................\Model\bin\Debug\Shjttz.GJJD.Model.dll
.................\.....\...\.....\Shjttz.GJJD.Model.pdb
.................\.

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