error learning process of a small test beginners Please do not laughed at

Packet : 33753166listviewaaa.rar filelist
ListView\App.ico
ListView\AssemblyInfo.cs
ListView\bin\Debug
ListView\bin
ListView\Form1.cs
ListView\Form1.resx
ListView\ListView.csproj
ListView\ListView.csproj.user
ListView\ListView.sln
ListView\ListView.suo
ListView\obj\Debug
ListView\obj
ListView

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