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The Transferring server event fires when the AutoPostBackOnTransfer="True" and the user tries to transfer an item / items. It fires before the Deleting server event (if not cancelled) once for all selected items. If this event is not cancelled and the AllowAutomaticUpdates="True" - the database is updated to reflect the new reordered list.

The event handler receives two parameters:

  1. The instance of the listbox firing the event

  2. An event arguments parameter containing the following properties:

  • Items - collection of all RadListBoxItem objects which will be affected by the transfer.

  • Cancel - set it to True to cancel the event and prevent the transfer to happen

protected void SourceListBox_Transferring(object sender, RadListBoxTransferringEventArgs e)
    e.Cancel = true;
Protected Sub SourceListBox_Transferring(sender As Object, e As RadListBoxTransferringEventArgs)
    e.Cancel = True
End Sub

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