Add Custom Value to SummaryTopRow

Hello, Vijay,

Please have in mind that the summary values are usually related to a specific column and the aggregated value of the cells belonging to this column:

https://docs.telerik.com/devtools/winforms/controls/gridview/rows/summary-rows

However, RadGridView provides a convenient API allowing you to define any custom logic for calculating the value that will be shown in the summary item. Thus, you can accomplish any custom action for aggregating the displayed value like demonstrated in the example from this article:

https://docs.telerik.com/devtools/winforms/controls/gridview/rows/summary-rows#extending-the-summaryitem 

I hope this information helps. If you need any further assistance please don't hesitate to contact me. 

Regards,
Dess | Tech Support Engineer, Principal
Progress Telerik