Answer Posted / rashmi thakur

ViewState is a built-in structure for automatically
retaining values among multiple requests for the same page.
The view state is internally maintained as a hidden field
on the page but is hashed, providing greater security than
developer-implemented hidden fields do.
Following are the benefits of using ViewState:-
 No server resources are required because state is
contained in a structure in the page code.
 Simplicity.
 States are retained automatically.
 The values in view state are hashed, compressed,
and encoded, thus representing a higher state of security
than hidden fields.
 ViewState is good for caching data in Web farm
configurations because the data is cached on the client.
Following are limitation of using ViewState:-
 Page loading and posting performance decreases when
large values are stored because
 View state is stored in the page.
 Although view state stores data in a hashed format,
it can still be tampered with because it is stored in a
hidden field on the page. The information in the hidden
field can also be seen if the page output source is viewed
directly, creating a potential security risk.
 If page get destroyed or refresh information which
is stored in view state gets vanished.

Below is sample of storing values in view state.
this.ViewState["EnterTime"] = DateTime.Now.ToString();

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