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CheckAllCheck
The CheckAllCheck event fires after a user checks or unchecks the CheckAll item.To fire automatically the AutoPostBack, heckBoxes and ShowCheckAll properties should be set to True.
The event handler receives two parameters:
-
The instance of the listbox firing the event
-
An event arguments parameter containing the following property:
- CheckAllChecked - shows true of false if the CheckAll checkbox is checked or unchecked