Answer Posted / waqas ahmed (http://www.themav

It allows you to control and change dependent fields in the
web form.

for example: if i have a dropdown of states and another
dropdown of cities with reference to the state, i want to
change the cities listitems when the user changes the state,
i would use autopostback property (good alternate is ajax
dropdown extender) and it will refresh my page by using
onselectedindex_changed property with my desired cities list
which is on the basis of the state selected.

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