This documentation topic describes legacy technology. We no longer develop new functionality for the GridControl and suggest that you use the new DataGridView control instead.
When data is grouped by a specific column, data rows are combined into groups. By default, each group contains rows which have the same value in the field (column) for which grouping has been applied. Use the GroupInterval property to change the logic used to decide which rows should be grouped together. For instance, for a column that displays date/time information, you can set its GroupInterval property to ColumnGroupInterval.DateRange. In this case, when grouping is applied against this column, the data rows will be combined into groups according to their date value compared with the current system date ("Today", "Yesterday", etc.).