Answer / ganesh

It allows the page to save the users input on a form across
postbacks. It saves the server-side values for a given
control into ViewState, which is stored as a hidden value on
the page before sending the page to the clients browser.
When the page is posted back to the server the server
control is recreated with the state stored in viewstate.

Answer / sudhir kunnure

Enableviewstate propery is on for page or any control then
it holding or catching or storing data in memory as well as
client side hedden value. when u post back data remains in
control or page.
if Enableviewstate property false then data remove when
post back.

Answer / satish v itagi

Web page is a stateless entity. To preserve data between
postbacks dot net provided to containers viz. ViewState and
Session.

Viewstate enables persistence of data across post backs in
web forms of dot net (web pages). The data is stored in
hidden field/s of the page. Hence data travels across
media between server and client making loading and un-
loading slow. The advantage is every page will have its
own viewstate data. Normally web controls will have
viewstate enabled. If viewstate is turned off, other data
also can be saved in viewstate.

Objects have to be serialised before putting in viewstate.
While accessing methods and properties of an object the
object has to be properly type casted.

At times, viewstate of a page can get corrupted, requiring
the whole application to be re-started. It is not good
idea to keep large objects in viewstate.

If performance is the issue turn off viewstate, if
persistence is the issue and you have small to medium sized
data enable viewstate.

Keeping state in Sessions is also a better solution.

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