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      How to: Calculate a summary against groups of nodes
      How to: Calculate the sum against all nodes
      How to: Implement a custom summary
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How to: Calculate the sum against all nodes

The following example demonstrates how to calculate the sum for the column bound to the "Size(Bytes)" field. The function type and summary value formatting are set via the TreeListColumn.SummaryFooter and TreeListColumn.SummaryFooterStrFormat properties.

The TreeListColumn.AllNodesSummary property is set to true to calculate the summary across all nodes within the control. The TreeListOptionsView.ShowSummaryFooter option is enabled to display the summary footer.

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