A simple example of multi-tier application development, code written in a very structured, can be used to study!

TopWinCS
........\Backup
........\......\BLL
........\......\...\AssemblyInfo.cs
........\......\...\BLL.csproj
........\......\...\BLL.csproj.user
........\......\...\BLL_Admin.cs
........\......\...\BLL_Ban.cs
........\......\...\BLL_MakeHTML.cs
........\......\...\BLL_MakeJS.cs
........\......\...\BLL_Security.cs
........\......\...\BLL_Vote_Result.cs
........\......\...\FormatInputStr.cs
........\......\Common
........\......\......\AssemblyInfo.cs
........\......\......\Common.cs
........\......\......\Common.csproj
........\......\......\Common.csproj.user
........\......\......\SystemCode.cs
........\......\DataAccess
........\......\..........\AssemblyInfo.cs
........\......\..........\BaseClass.cs
........\......\..........\DataAccess.csproj
........\......\..........\DataAccess.csproj.user
........\......\..........\DA_Admin.cs
........\......\..........\DA_Admin_Admin_Role.cs
........\......\..........\DA_Admin_Announce.cs
........\......\..........\DA_Admin_Article.cs
........\......\..........\DA_Admin_Article_Comment.cs
........\......\..........\DA_Admin_Article_Special.cs
........\......\..........\DA_Admin_Friend_Link.cs
........\......\..........\DA_Admin_Login.cs
........\......\..........\DA_Admin_Logout.cs
........\......\..........\DA_Admin_MakeHTML.cs
........\......\..........\DA_Admin_Vote.cs
........\......\..........\DA_Ban.cs
........\......\..........\DA_CheckHaveData.cs
........\......\..........\DA_Guestbook.cs
........\......\..........\DA_Index_Article.cs
........\......\..........\DA_Search.cs
........\......\..........\DA_Vote.cs
........\......\TopWinCS.sln
........\......\WebUI
........\BLL
........\...\AssemblyInfo.cs
........\...\bin
........\...\...\Debug
........\...\...\Release
........\...\BLL.csproj
........\...\BLL.csproj.user
........\...\BLL_Admin.cs
........\...\BLL_Ban.cs
........\...\BLL_MakeHTML.cs
........\...\BLL_MakeJS.cs
........\...\BLL_Result.cs
........\...\BLL_Security.cs
........\...\BLL_Vote_Result.cs
........\...\FormatInputStr.cs
........\...\MakeJS.cs
........\...\obj
........\...\...\Debug
........\...\...\Release
........\Common
........\......\AssemblyInfo.cs
........\......\bin
........\......\...\Debug
........\......\...\Release
........\......\Common.cs
........\......\Common.csproj
........\......\Common.csproj.user
........\......\obj
........\......\...\Debug
........\......\...\Release
........\......\SystemCode.cs
........\DataAccess
........\..........\AssemblyInfo.cs
........\..........\BaseClass.cs
........\..........\bin
........\..........\...\Debug
........\..........\...\Release
........\..........\DataAccess.csproj
........\..........\DataAccess.csproj.user
........\..........\DA_Admin.cs
........\..........\DA_Admin_Admin_Role.cs
........\..........\DA_Admin_Announce.cs
........\..........\DA_Admin_Article.cs
........\..........\DA_Admin_Article_Comment.cs
........\..........\DA_Admin_Article_Special.cs
........\..........\DA_Admin_Friend_Link.cs
........\..........\DA_Admin_Login.cs
........\..........\DA_Admin_Logout.cs
........\..........\DA_Admin_MakeHTML.cs
........\..........\DA_Admin_Vote.cs
........\..........\DA_Ban.cs
........\..........\DA_CheckHaveData.cs
........\..........\DA_Guestbook.cs
........\..........\DA_Index_Article.cs
........\..........\DA_Search.cs
........\..........\DA_Vote.cs
........\..........\obj

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