This example shows how to calculate group summaries and display them within group rows. A group summary is a value of the aggregate function calculated over all data rows within a group. The GridControl's GroupSummary collection stores group summary items.

This example uses the GridControl.CustomSummaryExists event / GridControl.CustomSummaryExistsCommand property to calculate group summaries only for the top group level.

• MainWindow.xaml (MainWindow.xaml)
• MainWindow.xaml.cs (MainWindow.xaml.vb)

• MainWindow.xaml (MainWindow.xaml)
• MainViewModel.cs (MainViewModel.vb)

• Data Summaries
• Group Summary
• GridControl.CustomSummaryExists
• GridControl.CustomSummaryExistsCommand

• How to Display Total Summaries
• How to Use Custom Summaries
• How to calculate custom Node Summaries in TreeListView