Buttons change color, and then the button will hide pictures, more suitable for novice learning

c#
..\test
..\....\test
..\....\test.sln
..\....\test.suo
..\....\....\bin
..\....\....\...\Debug
..\....\....\...\.....\test.exe
..\....\....\...\.....\test.pdb
..\....\....\...\.....\test.vshost.exe
..\....\....\...\.....\test.vshost.exe.manifest
..\....\....\Form1.cs
..\....\....\Form1.Designer.cs
..\....\....\Form1.resx
..\....\....\obj
..\....\....\...\x86
..\....\....\...\...\Debug
..\....\....\...\...\.....\DesignTimeResolveAssemblyReferences.cache
..\....\....\...\...\.....\DesignTimeResolveAssemblyReferencesInput.cache
..\....\....\...\...\.....\GenerateResource.read.1.tlog
..\....\....\...\...\.....\GenerateResource.write.1.tlog
..\....\....\...\...\.....\TempPE
..\....\....\...\...\.....\......\Properties.Resources.Designer.cs.dll
..\....\....\...\...\.....\test.csproj.FileListAbsolute.txt
..\....\....\...\...\.....\test.exe
..\....\....\...\...\.....\test.Form1.resources
..\....\....\...\...\.....\test.pdb
..\....\....\...\...\.....\test.Properties.Resources.resources
..\....\....\Program.cs
..\....\....\Properties
..\....\....\..........\AssemblyInfo.cs
..\....\....\..........\green.png
..\....\....\..........\meinv.jpg
..\....\....\..........\red.png
..\....\....\..........\Resources.Designer.cs
..\....\....\..........\Resources.resx
..\....\....\..........\Settings.Designer.cs
..\....\....\..........\Settings.settings
..\....\....\..........\美女2.jpg
..\....\....\test.csproj

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