c# 100 cases, the first chapter, in section IV of the examples, you can look at the following

Packet : 73462663forth.rar filelist
第4例\testClassApp\App.ico
第4例\testClassApp\AssemblyInfo.cs
第4例\testClassApp\Class1.cs
第4例\testClassApp\testClassApp.csproj
第4例\testClassApp\testClassApp.csproj.user
第4例\testClassApp\testClassApp.sln
第4例\testClassApp\testClassApp.suo
第4例\testClassApp1.jpg
第4例\testClassApp\bin\Debug
第4例\testClassApp\obj\Debug
第4例\testClassApp\bin
第4例\testClassApp\obj
第4例\testClassApp
第4例

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