Catching Unselecting All in ListView — SelectedIndexChanged Firing Twice

Question

Basically, I have a ListView of items. When one is selected, a text box comes into view on the right to display more details of that item (takes a little time for the item

Answer 1

In any control where you can select multiple items, SelectedIndexChanged event fires twice. One, to remove the deselected item and then to add selected item. When you click first time, selected items collection is null and hence it fired once. Next time it will fire twice.