Achieve folded DataGridview

CollapseDataGridViewDemo\CollapseDataGridViewDemo\bin\Debug\CollapseDataGridViewDemo.exe
........................\........................\...\.....\CollapseDataGridViewDemo.pdb
........................\........................\...\.....\CollapseDataGridViewDemo.vshost.exe
........................\........................\...\.....\CollapseDataGridViewDemo.vshost.exe.manifest
........................\........................\ClassDiagram1.cd
........................\........................\CollapseDataGridViewDemo.csproj
........................\........................\..ntrols\CollapseDataGridView.cs
........................\........................\........\CollapseDataGridView.Designer.cs
........................\........................\Form1.cs
........................\........................\Form1.Designer.cs
........................\........................\Form1.resx
........................\........................\Model\Athlete.cs
........................\........................\.....\DemoModel.cs
........................\........................\obj\Debug\CollapseDataGridViewDemo.csproj.FileListAbsolute.txt
........................\........................\...\.....\CollapseDataGridViewDemo.csproj.GenerateResource.Cache
........................\........................\...\.....\CollapseDataGridViewDemo.DemoForm.resources
........................\........................\...\.....\CollapseDataGridViewDemo.exe
........................\........................\...\.....\CollapseDataGridViewDemo.pdb
........................\........................\...\.....\CollapseDataGridViewDemo.Properties.Resources.resources
........................\........................\...\.....\TempPE\Properties.Resources.Designer.cs.dll
........................\........................\Program.cs
........................\........................\...perties\AssemblyInfo.cs
........................\........................\..........\Resources.Designer.cs
........................\........................\..........\Resources.resx
........................\........................\..........\Settings.Designer.cs
........................\........................\..........\Settings.settings
........................\........................\Resourses\Collapse.png
........................\........................\.........\Expand.png
........................\CollapseDataGridViewDemo.sln
........................\CollapseDataGridViewDemo.suo
........................\........................\obj\Debug\Refactor
........................\........................\...\.....\TempPE
........................\........................\bin\Debug
........................\........................\obj\Debug
........................\........................\bin
........................\........................\Controls
........................\........................\Model
........................\........................\obj
........................\........................\Properties
........................\........................\Resourses
........................\CollapseDataGridViewDemo
CollapseDataGridViewDemo

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