follow technology classic example in project: 1.asp.net insert update delete select 2.three tier 3.log4net 4.handling exception in project

员工管理系统\员工管理系统_三层结构_2008版\BLL\bin\Debug\BLL.dll
............\............................\...\...\.....\BLL.pdb
............\............................\...\...\.....\Common.dll
............\............................\...\...\.....\Common.pdb
............\............................\...\...\.....\DAL.dll
............\............................\...\...\.....\DAL.pdb
............\............................\...\...\.....\log4net.dll
............\............................\...\...\.....\Model.dll
............\............................\...\...\.....\Model.pdb
............\............................\...\BLL.csproj
............\............................\...\EmployeeBLL.cs
............\............................\...\obj\Debug\BLL.csproj.FileListAbsolute.txt
............\............................\...\...\.....\BLL.dll
............\............................\...\...\.....\BLL.pdb
............\............................\...\...\.....\ResolveAssemblyReference.cache
............\............................\...\Properties\AssemblyInfo.cs
............\............................\Common\bin\Debug\Common.dll
............\............................\......\...\.....\Common.pdb
............\............................\......\...\.....\log4net.dll
............\............................\......\Common.csproj
............\............................\......\DBUtil.cs
............\............................\......\EMSException.cs
............\............................\......\EMSLogger.cs
............\............................\......\lib\log4net.dll
............\............................\......\obj\Debug\Common.csproj.FileListAbsolute.txt
............\............................\......\...\.....\Common.dll
............\............................\......\...\.....\Common.pdb
............\............................\......\Properties\AssemblyInfo.cs
............\............................\......\SQLHelper.cs
............\............................\DAL\bin\Debug\Common.dll
............\............................\...\...\.....\Common.pdb
............\............................\...\...\.....\DAL.dll
............\............................\...\...\.....\DAL.pdb
............\............................\...\...\.....\log4net.dll
............\............................\...\...\.....\Model.dll
............\............................\...\...\.....\Model.pdb
............\............................\...\DAL.csproj
............\............................\...\DepartmentDAL.cs
............\............................\...\EmployeeDAL.cs
............\............................\...\obj\Debug\DAL.csproj.FileListAbsolute.txt
............\............................\...\...\.....\DAL.dll
............\............................\...\...\.....\DAL.pdb
............\............................\...\...\.....\ResolveAssemblyReference.cache
............\............................\...\PositionDAL.cs
............\............................\...\.roperties\AssemblyInfo.cs
............\............................\...\UserInfoDAL.cs
............\............................\data\EmployeeDB.sql
............\............................\ExceptionTest\bin\Debug\Common.dll
............\............................\.............\...\.....\Common.pdb
............\............................\.............\...\.....\ExceptionTest.exe
............\............................\.............\...\.....\ExceptionTest.pdb
............\............................\.............\...\.....\ExceptionTest.vshost.exe
............\............................\.............\...\.....\ExceptionTest.vshost.exe.manifest
............\............................\.............\...\.....\log4net.dll
............\............................\.............\EmployeeBLL.cs
............\............................\.............\ExceptionTest.csproj
............\............................\.............\Form1.cs
............\............................\.............\Form1.Designer.cs
............\.....................

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