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The value of the DataControlFieldHeaderCell.Scope property is rendered as an HTML scope attribute by the System.Web.UI.WebControls.DataControlFieldHeaderCell object. Although the DataControlFieldHeaderCell.Scope property is initialized to TableHeaderScope.NotSet, you should set it to either TableHeaderScope.Column or TableHeaderScope.Row, depending on the cells that the header represents.
The value of the DataControlFieldHeaderCell.Scope property is stored in view state.