Three (factory mode) a simple message board to use a simple example of the message board to explain the three-tier structure (factory mode) of use, which database operations using SqlHelper were stratified into were: MessagesBoard (web tier), SQLServerDAL, DALFactory, IDAL, BLLDB_51aspx for Sql database, attached to

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......\FactoryMessage
......\..............\BLL
......\..............\...\bin
......\..............\...\...\Debug
......\..............\...\BLL.csproj
......\..............\...\Messages.cs
......\..............\...\obj
......\..............\...\...\BLL.csproj.FileList.txt
......\..............\...\...\Debug
......\..............\...\Properties
......\..............\...\..........\AssemblyInfo.cs
......\..............\DALFactory
......\..............\..........\bin
......\..............\..........\...\Debug
......\..............\..........\DALFactory.csproj
......\..............\..........\DataAcess.cs
......\..............\..........\obj
......\..............\..........\...\DALFactory.csproj.FileList.txt
......\..............\..........\...\Debug
......\..............\..........\Properties
......\..............\..........\..........\AssemblyInfo.cs
......\..............\DB_51aspx
......\..............\.........\MessageBoard.mdf
......\..............\.........\MessageBoard_log.LDF
......\..............\IDAL
......\..............\....\bin
......\..............\....\...\Debug
......\..............\....\IDAL.csproj
......\..............\....\IMessageBoard.cs
......\..............\....\obj
......\..............\....\...\Debug
......\..............\....\...\IDAL.csproj.FileList.txt
......\..............\....\Properties
......\..............\....\..........\AssemblyInfo.cs
......\..............\MessagesBoard
......\..............\.............\App_Data
......\..............\.............\Bin
......\..............\.............\...\BLL.dll
......\..............\.............\...\BLL.dll.refresh
......\..............\.............\...\BLL.pdb
......\..............\.............\...\DALFactory.dll
......\..............\.............\...\DALFactory.dll.refresh
......\..............\.............\...\DALFactory.pdb
......\..............\.............\...\IDAL.dll
......\..............\.............\...\IDAL.dll.refresh
......\..............\.............\...\IDAL.pdb
......\..............\.............\...\MessagesBoard.SQLServerDAL.dll
......\..............\.............\...\MessagesBoard.SQLServerDAL.dll.refresh
......\..............\.............\...\MessagesBoard.SQLServerDAL.pdb
......\..............\.............\...\Model.dll
......\..............\.............\...\Model.dll.refresh
......\..............\.............\...\Model.pdb
......\..............\.............\Send.aspx
......\..............\.............\Send.aspx.cs
......\..............\.............\Show.aspx
......\..............\.............\Show.aspx.cs
......\..............\.............\Web.Config
......\..............\MessagesBoard.sln
......\..............\Model
......\..............\.....\bin
......\..............\.....\...\Debug
......\..............\.....\MessageBoardInfo.cs
......\..............\.....\Model.csproj
......\..............\.....\obj
......\..............\.....\...\Debug
......\..............\.....\...\Model.csproj.FileList.txt
......\..............\.....\Properties
......\..............\.....\..........\AssemblyInfo.cs
......\..............\read-me.htm
......\..............\SQLServerDAL
......\..............\............\bin
......\..............\............\...\Debug
......\..............\............\Messages.cs
......\..............\............\obj
......\..............\............\...\Debug
......\..............\............\...\SQLServerDAL.csproj.FileList.txt
......\..............\............\Properties
......\..............\............\..........\AssemblyInfo.cs
......\..............\............\SQLHelper.cs
......\..............\............\SQLServerDAL.csproj
......\..............\源码必读.txt

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