Hi Santosh,
Thank you for your interest in Syncfusion products.
We suggest you to use SQL queries to Insert, update and Delete records. You can retrieve values that all updated/added in GridGroupingControl, from GridDataSourceControlRowAddingEventArgs's object. The values are stored in variable, e.NewValues[](array of updated values), e.OldValues[](array of original value) in concerning event Handler functions. Refer the below link to learn more about event handlers.
http://help.syncfusion.com/ug_74/gridweb/DataEditUpdateDelete.html Let me know if you have any concerns.
Regards,
Bharath .M