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RadGridViewGroupByChanging Event
Fires when grouping is changing. The action can be canceled.

Namespace: Telerik.WinControls.UI
Assembly: Telerik.WinControls.GridView (in Telerik.WinControls.GridView.dll) Version: 2018.1.220.40 (2018.1.220.40)
Syntax
public event GridViewCollectionChangingEventHandler GroupByChanging

Value

Type: Telerik.WinControls.UIGridViewCollectionChangingEventHandler
See Also