c# write custom datagridview can click on of+, or- button to fold datagridview

db
..\sql2000Test_Data.MDF
..\sql2000Test_Log.LDF
MapEagleViewControl
...................\MapEagleViewControl
...................\MapEagleViewControl.sln
...................\MapEagleViewControl.suo
...................\...................\bin
...................\...................\...\Debug
...................\...................\...\.....\MapEagleViewControl.exe
...................\...................\...\.....\MapEagleViewControl.pdb
...................\...................\...\.....\MapEagleViewControl.vshost.exe
...................\...................\...\.....\MapEagleViewControl.vshost.exe.manifest
...................\...................\CollapseDataGridView
...................\...................\....................\CustomDataGridView.cs
...................\...................\....................\SQLHelper.cs
...................\...................\CustomDataGridView.cs
...................\...................\EagleView
...................\...................\.........\MapEagleViewControl.cs
...................\...................\.........\MapEagleViewControl.Designer.cs
...................\...................\.........\MapEagleViewControl.resx
...................\...................\Form1.cs
...................\...................\Form1.Designer.cs
...................\...................\Form1.resx
...................\...................\MapEagleViewControl.cs
...................\...................\MapEagleViewControl.csproj
...................\...................\MapEagleViewControl.csproj.user
...................\...................\MapEagleViewControl.Designer.cs
...................\...................\MapEagleViewControl.resx
...................\...................\minus.gif
...................\...................\obj
...................\...................\...\Debug
...................\...................\...\.....\Control.CustomLib.Form1.resources
...................\...................\...\.....\Control.CustomLib.MapEagleViewControl.resources
...................\...................\...\.....\MapEagleViewControl.csproj.FileListAbsolute.txt
...................\...................\...\.....\MapEagleViewControl.csproj.GenerateResource.Cache
...................\...................\...\.....\MapEagleViewControl.exe
...................\...................\...\.....\MapEagleViewControl.Form1.resources
...................\...................\...\.....\MapEagleViewControl.MapEagleViewControl.resources
...................\...................\...\.....\MapEagleViewControl.pdb
...................\...................\...\.....\MapEagleViewControl.Properties.Resources.resources
...................\...................\...\.....\Refactor
...................\...................\...\.....\ResolveAssemblyReference.cache
...................\...................\...\.....\TempPE
...................\...................\...\.....\......\Properties.Resources.Designer.cs.dll
...................\...................\...\MapEagleViewControl.csproj.FileList.txt
...................\...................\plus.gif
...................\...................\Program.cs
...................\...................\Properties
...................\...................\..........\AssemblyInfo.cs
...................\...................\..........\Resources.Designer.cs
...................\...................\..........\Resources.resx
...................\...................\..........\Settings.Designer.cs
...................\...................\..........\Settings.settings
动态折叠DataGridView
....................\db
....................\..\sql2000Test_Data.MDF
....................\..\sql2000Test_Log.LDF
....................\MapEagleViewControl
....................\...................\MapEagleViewControl
....................\...................\MapEagleViewControl.sln
....................\...................\MapEagleViewControl.suo
....................\...................\...................\bin
....................\...................\...................\...\Debug
....................\...................\...................\...\.....\MapEagleViewControl

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