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:

1. The instance of the listbox firing the event

2. An event arguments parameter containing the following property:

• CheckAllChecked - shows true of false if the CheckAll checkbox is checked or unchecked