Gets or sets the axis attribute of the HTML th element for the System.Web.UI.WebControls.TableHeaderCell control.
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The categories can be any string values that are pertinent to the table. The TableHeaderCell.CategoryText property is rendered as the axis attribute of the HTML th element, which is used to group table cells into conceptual categories. The categories are rendered in HTML as a comma-delimited list.
The value of this property is stored in view state.