c# 100 cases, the first chapter, section III example, you can look at the following

Packet : 83390047third.rar filelist
第3例\CValueApp\App.ico
第3例\CValueApp\AssemblyInfo.cs
第3例\CValueApp\Backup\App.ico
第3例\CValueApp\Backup\AssemblyInfo.cs
第3例\CValueApp\Backup\Class1.cs
第3例\CValueApp\Backup\CValueApp.csproj
第3例\CValueApp\Backup\CValueApp.csproj.user
第3例\CValueApp\Backup\CValueApp.sln
第3例\CValueApp\Backup\CValueApp.suo
第3例\CValueApp\Class1.cs
第3例\CValueApp\CValueApp.csproj
第3例\CValueApp\CValueApp.csproj.user
第3例\CValueApp\CValueApp.sln
第3例\CValueApp\CValueApp.suo
第3例\CValueApp\UpgradeLog.XML
第3例\CValueApp\_UpgradeReport_Files\UpgradeReport.css
第3例\CValueApp\_UpgradeReport_Files\UpgradeReport.xslt
第3例\CValueApp\_UpgradeReport_Files\UpgradeReport_Minus.gif
第3例\CValueApp\_UpgradeReport_Files\UpgradeReport_Plus.gif
第3例\CValueApp1.jpg
第3例\CValueApp\bin\Debug
第3例\CValueApp\obj\Debug
第3例\CValueApp\Backup
第3例\CValueApp\bin
第3例\CValueApp\obj
第3例\CValueApp\_UpgradeReport_Files
第3例\CValueApp
第3例

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