Group summaries are calculated for each group of nodes that have the same parent. Below you'll find information on setting up group summaries.
There are two basic things that have to be done to calculate a group summary, and display its result within group footers.
Specify the type of summary to calculate for a column.
Make group footers visible.
The following example demonstrates how to apply a group summary to the Tree List control. The TreeListColumn.RowFooterSummary and TreeListColumn.RowFooterSummaryStrFormat properties are used to set the function type and apply formatting to summary values. The TreeListOptionsView.ShowRowFooterSummary option is enabled to display row footers.
The following image shows the result: