Description: Use C# DataGridview ComboBox, realize Column can manually enter freely. Use the drop down box in winform datagridview, you can either choose from a drop-down box data, but also allows the user to manually enter the data entered. Although simple, but feel very useful features.
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File list (Check if you may need any files):
WinFormAPP\WinFormAPP\Form1.cs
..........\..........\Form1.Designer.cs
..........\..........\Form1.resx
..........\..........\Program.cs
..........\..........\...perties\AssemblyInfo.cs
..........\..........\..........\Resources.Designer.cs
..........\..........\..........\Resources.resx
..........\..........\..........\Settings.Designer.cs
..........\..........\..........\Settings.settings
..........\..........\WinFormAPP.csproj
..........\WinFormAPP.sln
..........\WinFormAPP.suo
..........\..........\Properties
..........\WinFormAPP
WinFormAPP