In GridDataControl, sorting can be performed by clicking the column header when the AllowSorting API is enabled. By default, the direction of sorting is in ascending order. If you want to change it to descending order, you can do so using SortColumnChangingEvent.
GridDataSortColumnChangingEventArgs has the following properties:
Action: Notifies the action that caused a CollectionChanged event. Here the sorting direction is changed based on the action ADD.
AddedItems: Collection of SortColumnDescription that are added to SortColumns.
RemovedItems: Collection of SortColumnDescription that has been removed from SortColumns.
AddedItems contains a new item that requires a change in the sorting direction. To do so, use the given code example,
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