The realization of the drop-down datagridview

DataWindow
..........\bin
..........\...\Debug
..........\...\.....\WindowsApplication21.exe
..........\...\.....\WindowsApplication21.pdb
..........\ClassDiagram1.cd
..........\DataGridViewDataWindowCell.cs
..........\DataGridViewDataWindowColumn.cs
..........\DataGridViewDataWindowEditingControl.cs
..........\DataWindow.cs
..........\DataWindow.csproj
..........\DataWindow.sln
..........\DataWindowFilter.cs
..........\DataWindowFilter.Designer.cs
..........\DataWindowFilter.resx
..........\Form1.cs
..........\Form1.Designer.cs
..........\Form1.resx
..........\obj
..........\...\DataWindow.csproj.FileList.txt
..........\...\DataWindow.csproj.FileListAbsolute.txt
..........\...\Debug
..........\...\.....\DataWindow.csproj.GenerateResource.Cache
..........\...\.....\WindowsApplication21.DataWindowFilter.resources
..........\...\.....\WindowsApplication21.exe
..........\...\.....\WindowsApplication21.Form1.resources
..........\...\.....\WindowsApplication21.pdb
..........\...\.....\WindowsApplication21.Properties.Resources.resources
..........\...\WindowsApplication21.csproj.FileList.txt
..........\Program.cs
..........\Properties
..........\..........\AssemblyInfo.cs
..........\..........\Resources.Designer.cs
..........\..........\Resources.resx
..........\..........\Settings.Designer.cs
..........\..........\Settings.settings

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