A three-tier video CSharp+ csharp source three-tier structure

Business
........\AssemblyInfo.cs
........\BCustomer.cs
........\bin
........\...\Debug
........\Business.csproj
........\Business.csproj.user
........\obj
........\...\Debug
Customer

........\AssemblyInfo.cs
........\bin
........\...\Debug
........\Customer.csproj
........\Customer.csproj.user
........\customer.sln
........\Data
........\....\dlyx_Data.MDF
........\....\dlyx_Log.LDF
........\Form1.cs
........\Form1.resx
........\Form2.cs
........\Form2.resx
........\MainForm.cs
........\MainForm.resx
........\obj
........\...\Debug
DBLayer
.......\AssemblyInfo.cs
.......\bin
.......\...\Debug
.......\config.cs
.......\DBAccess.cs
.......\DBCustomer.cs
.......\DBLayer.csproj
.......\DBLayer.csproj.user
.......\DBLayer.sln
.......\obj
.......\...\Debug
录像001.exe
录像002.exe
录像003.exe
录像004.exe
录像005.exe

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