Tutorial code C# with 3-tier window application C#

v1.0
....\BusinessLogicTier
....\.................\app.config
....\.................\bin
....\.................\...\Debug
....\.................\BookDTO.cs
....\.................\BookManagementService.cs
....\.................\BusinessLogicTier.csproj
....\.................\Demo3Tiers.dbml
....\.................\Demo3Tiers.dbml.layout
....\.................\Demo3Tiers.designer.cs
....\.................\Demo3Tiers.snk
....\.................\IBookManagementService.cs
....\.................\NotAuthorizedException.cs
....\.................\obj
....\.................\...\Debug
....\.................\...\.....\BusinessLogicTier.csproj.FileListAbsolute.txt
....\.................\...\.....\Refactor
....\.................\...\.....\........\BusinessLogicTier.dll
....\.................\...\.....\TempPE
....\.................\...\.....\......\Demo3Tiers.designer.cs.dll
....\.................\Properties
....\.................\..........\AssemblyInfo.cs
....\.................\..........\Settings.Designer.cs
....\.................\..........\Settings.settings
....\.................\UserNotFoundException.cs
....\Database.sql
....\Demo3Tiers.sln
....\Demo3Tiers.suo
....\PresentationTier
....\................\bin
....\................\...\Debug
....\................\...\.....\BusinessLogicTier.tlb
....\................\...\.....\PresentationTier.vshost.exe
....\................\...\.....\PresentationTier.vshost.exe.manifest
....\................\EditBookForm.cs
....\................\EditBookForm.Designer.cs
....\................\EditBookForm.resx
....\................\LoginForm.cs
....\................\LoginForm.Designer.cs
....\................\LoginForm.resx
....\................\ManagementForm.cs
....\................\ManagementForm.Designer.cs
....\................\ManagementForm.resx
....\................\obj
....\................\...\Debug
....\................\...\.....\PresentationTier.csproj.FileListAbsolute.txt
....\................\...\.....\Refactor
....\................\...\.....\TempPE
....\................\PresentationTier.csproj
....\................\Program.cs
....\................\Properties
....\................\..........\AssemblyInfo.cs
....\................\..........\Resources.Designer.cs
....\................\..........\Resources.resx
....\................\..........\Settings.Designer.cs
....\................\..........\Settings.settings

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