C# WinForm procedures used to achieve a wireframe Graphics square rotation, two page swapping, suitable for beginners but can not find a good tutorial 3D-based shoes

Griphics_1
..........\Griphics_1.sln
..........\Griphics_1.v11.suo
..........\MyTest
..........\......\$tf
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..........\......\...\.\a341e821-fc38-431b-a266-a3afd9804f4b.rw
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..........\......\...\localversion.tf1
..........\......\...\localversion.tfb
..........\......\...\pendingchanges.tf1
..........\......\...\pendingchanges.tfb
..........\......\...\properties.tf1
..........\......\BuildProcessTemplates
..........\......\.....................\AzureContinuousDeployment.11.xaml
..........\......\.....................\DefaultTemplate.11.1.xaml
..........\......\.....................\LabDefaultTemplate.11.xaml
..........\......\.....................\UpgradeTemplate.xaml
..........\WindowsFormsApplication1
..........\........................\Camear.cs
..........\........................\Engine.cs
..........\........................\Form1.Designer.cs
..........\........................\Form1.cs
..........\........................\Form1.resx
..........\........................\Interfaces
..........\........................\..........\IRecord.cs
..........\........................\Page.cs
..........\........................\Program.cs
..........\........................\Properties
..........\........................\..........\AssemblyInfo.cs
..........\........................\..........\Resources.Designer.cs
..........\........................\..........\Resources.resx
..........\........................\..........\Settings.Designer.cs
..........\........................\..........\Settings.settings
..........\........................\Service References
..........\........................\Vectors
..........\........................\.......\Vector2D.cs
..........\........................\.......\Vector3D.cs
..........\........................\WindowsFormsApplication1.csproj
..........\........................\bin
..........\........................\...\Debug
..........\........................\...\.....\WindowsFormsApplication1.exe
..........\........................\...\.....\WindowsFormsApplication1.pdb
..........\........................\...\.....\WindowsFormsApplication1.vshost.exe
..........\........................\...\.....\WindowsFormsApplication1.vshost.exe.manifest
..........\........................\...\Release
..........\........................\obj
..........\........................\...\Debug
..........\........................\...\.....\DesignTimeResolveAssemblyReferences.cache
..........\........................\...\.....\DesignTimeResolveAssemblyReferencesInput.cache
..........\........................\...\.....\TempPE
..........\........................\...\.....\WindowsFormsApplication1.Form1.resources
..........\........................\...\.....\WindowsFormsApplication1.Properties.Resources.resources
..........\........................\...\.....\WindowsFormsApplication1.csproj.FileListAbsolute.txt
..........\........................\...\.....\WindowsFormsApplication1.csproj.GenerateResource.Cache
..........\........................\...\.....\WindowsFormsApplication1.csprojResolveAssemblyReference.cache
..........\........................\...\.....\WindowsFormsApplication1.exe
..........\........................\...\.....\WindowsFormsApplication1.pdb

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