Occurs before the control starts recalculating its data.
NuGet Package: DevExpress.Web
The BeginRefresh event's data class is EventArgs.
The BeginRefresh and ASPxPivotGrid.EndRefresh events serve as notifications for operations on data (for instance, sorting and grouping data). The BeginRefresh event fires before an operation starts, and the ASPxPivotGrid.EndRefresh fires after the operation has been completed.