What is Difference between Callbacks and Postback in ASP.NET?
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Answer Posted / chandra sekhar dola
The difference between a callback and postback is that, as
with a postback, a callback does not refresh the currently
viewed page (i.e. does not redraw the page). You can think
of it as a quick trip back to get some data etc. For
example if there were two drop down boxes, the second
dependant on the value of the first, when a user selects a
value of a the first, rather then posting the whole page,
doing some server side calculations and returning a new
whole page to the client, a callback can enable you to only
go fetch the required data. Obviously from this, View State
is not updated with a callback (it's the same instance of
the page just updated!!!).
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