Use. Net three-tier system is simple in principle the query, and delete functions

MyOffice\BLL\bin\Debug\BLL.dll
........\...\...\.....\BLL.pdb
........\...\...\.....\DAL.dll
........\...\...\.....\DAL.pdb
........\...\BLL.csproj
........\...\DepartmentBLL.cs
........\...\obj\Debug\BLL.csproj.FileListAbsolute.txt
........\...\...\.....\BLL.dll
........\...\...\.....\BLL.pdb
........\...\...\.....\Refactor\BLL.dll
........\...\...\.....\ResolveAssemblyReference.cache
........\...\Properties\AssemblyInfo.cs
........\DAL\bin\Debug\DAL.dll
........\...\...\.....\DAL.pdb
........\...\DAL.csproj
........\...\DepartmentDAL.cs
........\...\obj\Debug\DAL.csproj.FileListAbsolute.txt
........\...\...\.....\DAL.dll
........\...\...\.....\DAL.pdb
........\...\...\.....\Refactor\DAL.dll
........\...\Properties\AssemblyInfo.cs
........\...\SQLHelp.cs
........\MyOffice.sln
........\WebUI\bin\BLL.dll
........\.....\...\BLL.pdb
........\.....\...\DAL.dll
........\.....\...\DAL.pdb
........\.....\...\WebUI.dll
........\.....\...\WebUI.pdb
........\.....\DepartmentList.aspx
........\.....\DepartmentList.aspx.cs
........\.....\DepartmentList.aspx.designer.cs
........\.....\obj\Debug\ResolveAssemblyReference.cache
........\.....\...\.....\WebUI.csproj.FileListAbsolute.txt
........\.....\...\.....\WebUI.dll
........\.....\...\.....\WebUI.pdb
........\.....\Properties\AssemblyInfo.cs
........\.....\Web.config
........\.....\WebUI.csproj
........\.....\WebUI.csproj.user
........\BLL\obj\Debug\Refactor
........\...\...\.....\TempPE
........\DAL\obj\Debug\Refactor
........\...\...\.....\TempPE
........\WebUI\obj\Debug\Refactor
........\.....\...\.....\TempPE
........\BLL\bin\Debug
........\...\obj\Debug
........\DAL\bin\Debug
........\...\obj\Debug
........\WebUI\obj\Debug
........\BLL\bin
........\...\obj
........\...\Properties
........\DAL\bin
........\...\obj
........\...\Properties
........\WebUI\App_Data
........\.....\bin
........\.....\obj
........\.....\Properties
........\BLL
........\DAL
........\WebUI
MyOffice

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