GridView displays three types of rows.
Data rows represent records in a data source. These rows are displayed one after another. Record values are arranged horizontally within them.
If grouping is applied, GridView displays group rows. These rows separate data row groups. They can be expanded and collapsed to show and hide data rows that belong to a group.
Preview rows are non-editable rows that allow large memo fields or custom data to be displayed across all columns within a GridView.
To learn more, see the Preview Row topic.