.NET Framework (current version)
Gets or sets the names of the primary key fields for the items displayed in a data-bound control.
System.Web (in System.Web.dll)
Private Property DataKeyNames As String() Implements IDataBoundControl.DataKeyNames
An array that contains the names of the primary-key fields for the items that are displayed in a GridView control.
This member is an explicit interface member implementation. It can be used only when the GridView instance is cast to an IDataBoundControl interface.
This property provides access to the DataKeyNames property of the GridView control. It is exposed through the IDataBoundControl Interface.
ASP.NET Dynamic Data supports this property.
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Available since 4.0