The header row is displayed at the top of the FormView control when the HeaderText or HeaderTemplate property is set. Use the HeaderRow property to programmatically access the FormViewRow object that represents the header row.
The HeaderRow property is available only after the FormView control creates the header row in the ItemCreated event.
This property is commonly used when you need to programmatically manipulate the header row, for example, when adding custom content. Any modification to the HeaderRow property must be performed after the FormView control has been rendered; otherwise, the FormView control overwrites any changes.