Detailed three-tier WEB development, can be a lot to learn for beginners progress quickly

3-tier application\best\best\bin\Debug\best.vshost.exe
..................\....\....\obj\SQLHelper.csproj.FileList.txt
..................\....\....\SQLHelper.cs
..................\....\....\SQLHelper1.csproj
..................\....\....\SQLTools.cs
..................\....\....\SystemError.cs
..................\....\best.sln
..................\....\best.suo
..................\....\BLL\bin\Debug\BLL.dll
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..................\....\...\...\.....\SQLHelper.pdb
..................\....\...\BLL.csproj
..................\....\...\customSystem.cs
..................\....\...\departmentSystem.cs
..................\....\...\obj\BLL.csproj.FileList.txt
..................\....\...\...\Debug\BLL.csproj.FileListAbsolute.txt
..................\....\...\...\.....\BLL.dll
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..................\....\...\...\.....\ResolveAssemblyReference.cache
..................\....\...\Properties\AssemblyInfo.cs
..................\....\DAL\bin\Debug\DAL.dll
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..................\....\...\...\.....\IDAL.dll
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..................\....\...\...\.....\SQLHelper.dll
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..................\....\...\customSQL.cs
..................\....\...\DAL.csproj
..................\....\...\departmentSQL.cs
..................\....\...\obj\DAL.csproj.FileList.txt
..................\....\...\...\.ebug\DAL.csproj.FileListAbsolute.txt
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..................\....\....\ICustom.cs
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..................\....\.....\Properties\AssemblyInfo.cs
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..................\....\.........\obj\Debug\SQLHelper.csproj.FileListAbsolute.txt
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..................\....\.........\...\SQLHelper.csproj.FileList.txt
..................\....\.........\Properties\AssemblyInfo.cs
..................\....\.........\SQLHelper.cs
..................\....\.........\SQLHelper.csproj
..................\....\.........\SQLTools.cs
..................\....\.........\SystemError.cs
..................\....\UpgradeLog.XML
..................\....\_UpgradeReport_Files\UpgradeReport.css
..................\....\....................\UpgradeReport.xs

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