Inserting
The Inserting server event fires when the AutoPostBackOnTransfer="True" and the user tries to insert an item / items. It fires after the Deleting server event (when items are transferred from another RadListBox control) once for all items which are about to be inserted.
The event handler receives two parameters:
The instance of the destination RadListBox firing the event
An event arguments parameter containing the following properties:
Items - collection of all RadListBoxItem objects which are about to be inserted.
Cancel - set it to True to cancel the event and prevent the insertion to happen
protected void DestinationListBox_Inserting(object sender, RadListBoxInsertingEventArgs e)
{
e.Cancel = true;
}
Protected Sub DestinationListBox_Inserting(sender As Object, e As RadListBoxInsertingEventArgs)
e.Cancel = True
End Sub