property Column.HeaderUnderline as Boolean
Retrieves or sets a value that indicates whether the column's caption should appear in underline.

TypeDescription
Boolean A boolean expression that indicates whether the column's caption should appear in underline. 
Use the HeaderUnderline property to specify whether the column's caption should appear in underline. Use the CellUnderline or ItemUnderline properties to specify whether the cell or the item should appear in underline. Use the HeaderItalic, HeaderBold or HeaderStrikeOut property to specify different font attributes when displaying the column's caption.