Adding two columns with the same caption is supported and they can be differentiated by their indexes or their keys. Use the Key property to assign a key to a column. Use the HTMLCaption property to use built-in HTML tags in the column's caption. Use the Add method to add a new column to the control's Columns collection, and to specify the column's caption at adding time. The column's caption is displayed using the following font attributes: HeaderBold, HeaderItalic, HeaderUnderline, HeaderStrikeout. The HeaderImage property assign an icon to the column's header.