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Use the DataKeyArray.IsReadOnly property to determine whether the items in the System.Web.UI.WebControls.DataKeyArray collection can be modified.
This property has been overridden to always return false, to indicate that the System.Web.UI.WebControls.DataKey objects in the System.Web.UI.WebControls.DataKeyArray object can be added or removed. The System.Web.UI.WebControls.DataKey objects themselves cannot be changed.