1, click the CheckBox column headers, Select and Unselect switching.. 2, CheckBox column header will select state according to the records, automatically render state is selected and not selected. 3, now only broke a two-state CheckBox column head back time to get hold of the tri-state.

自定义DataGridView控件源码
..........................\bin
..........................\...\Debug
..........................\...\.....\CheckBoxHeaderDemo.exe
..........................\...\.....\CheckBoxHeaderDemo.pdb
..........................\...\.....\CheckBoxHeaderDemo.vshost.exe
..........................\...\.....\CheckBoxHeaderDemo.vshost.exe.manifest
..........................\CheckBoxHeaderDemo.csproj
..........................\CheckBoxHeaderDemo.sln
..........................\CheckBoxHeaderDemo.suo
..........................\DataGridViewAssert.cs
..........................\DatagridViewCheckBoxHeaderCell.cs
..........................\Form1.cs
..........................\Form1.Designer.cs
..........................\Form1.resx
..........................\obj
..........................\...\x86
..........................\...\...\Debug
..........................\...\...\.....\CheckBoxHeaderDemo.csproj.FileListAbsolute.txt
..........................\...\...\.....\CheckBoxHeaderDemo.csproj.GenerateResource.Cache
..........................\...\...\.....\CheckBoxHeaderDemo.exe
..........................\...\...\.....\CheckBoxHeaderDemo.Form1.resources
..........................\...\...\.....\CheckBoxHeaderDemo.pdb
..........................\...\...\.....\CheckBoxHeaderDemo.Properties.Resources.resources
..........................\...\...\.....\DesignTimeResolveAssemblyReferences.cache
..........................\...\...\.....\DesignTimeResolveAssemblyReferencesInput.cache
..........................\...\...\.....\TempPE
..........................\Program.cs
..........................\Properties
..........................\..........\AssemblyInfo.cs
..........................\..........\Resources.Designer.cs
..........................\..........\Resources.resx
..........................\..........\Settings.Designer.cs
..........................\..........\Settings.settings
..........................\功能介绍.txt

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