Model how to develop a simple three-tier process csharp

Solution(三层的标准代码）
.........................\Build_Access.bat
.........................\Build_Oracle.bat
.........................\Build_SQLServer.bat
.........................\Business
.........................\........\bin
.........................\........\...\Debug
.........................\........\...\.....\Business.dll
.........................\........\...\.....\Business.pdb
.........................\........\...\.....\DALFactory.dll
.........................\........\...\.....\DALFactory.pdb
.........................\........\...\.....\EntityReflect.dll
.........................\........\...\.....\EntityReflect.pdb
.........................\........\Business.csproj
.........................\........\BusinessLogic.cs
.........................\........\obj
.........................\........\...\Business.csproj.FileList.txt
.........................\........\...\Debug
.........................\........\...\.....\Business.dll
.........................\........\...\.....\Business.pdb
.........................\........\...\.....\ResolveAssemblyReference.cache
.........................\........\...\.....\TempPE
.........................\........\Properties
.........................\........\..........\AssemblyInfo.cs
.........................\DALFactory
.........................\..........\bin
.........................\..........\...\Debug
.........................\..........\...\.....\DALFactory.dll
.........................\..........\...\.....\DALFactory.pdb
.........................\..........\...\.....\EntityReflect.dll
.........................\..........\...\.....\EntityReflect.pdb
.........................\..........\DALFactory.csproj
.........................\..........\GetDatabaseType.cs
.........................\..........\IDataAccessObject.cs
.........................\..........\obj
.........................\..........\...\DALFactory.csproj.FileList.txt
.........................\..........\...\Debug
.........................\..........\...\.....\DALFactory.dll
.........................\..........\...\.....\DALFactory.pdb
.........................\..........\...\.....\ResolveAssemblyReference.cache
.........................\..........\...\.....\TempPE
.........................\..........\Properties
.........................\..........\..........\AssemblyInfo.cs
.........................\DataAccess
.........................\..........\bin
.........................\..........\...\Debug
.........................\..........\...\.....\DALFactory.dll
.........................\..........\...\.....\DALFactory.pdb
.........................\..........\...\.....\DataAccess.dll
.........................\..........\...\.....\DataAccess.pdb
.........................\..........\...\.....\EntityReflect.dll
.........................\..........\...\.....\EntityReflect.pdb
.........................\..........\DAOAccess.cs
.........................\..........\DataAccess.csproj
.........................\..........\obj
.........................\..........\...\DataAccess.csproj.FileList.txt
.........................\..........\...\Debug
.........................\..........\...\.....\DataAccess.dll
.........................\..........\...\.....\DataAccess.pdb
.........................\..........\...\.....\TempPE
.........................\..........\Properties
.........................\..........\..........\AssemblyInfo.cs
.........................\DataOracle
.........................\..........\bin
.........................\..........\...\Debug
.........................\..........\...\.....\DALFactory.dll
.........................\..........\...\.....\DALFactory.pdb
.........................\..........\...\.....\DataOracle.dll
.........................\..........\...\.....\DataOracle.pdb
.........................\..........\...\.....\EntityReflect.dll
.........................\..........\...\.....\EntityReflect.pdb
.........................\..........\DAOOracle.cs
.........................\..........\DataOracle.csproj
.........................\..........\obj
.........................\..........\...\DataOracle.csproj.FileList

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