Use the TemplateColumn.HeaderTemplate property to control the appearance of the heading section in the System.Web.UI.WebControls.TemplateColumn object. The appearance is specified by creating a template that defines how the item is rendered in the column. To specify a template for the item selected for editing, first place opening and closing <HeaderTemplate> tags between the opening and closing tags of the <TemplateColumn> element. You can then list the content that controls the appearance of the item between the opening and closing <HeaderTemplate> tags. The content can be as simple as plain text, or can be made more complex by embedding other controls in the template.