Create custom summary in ASPxGridView that is based on data from several columns, and cannot be implemented with the help of standard summaries AVG, COUNT, etc.. No additional objects, or even classes to keep aggregative state during custom summary calculation.
You don’t even need event handler for CustomSummaryCalculate event. Just simple expression
SUM( Column1 + Column2 ) / Column3
Create custom summary for XtraReports without custom classes for state maintenance or additionald event handlers for XRLabel