View State is one of the most important and useful
client side state management
mechanism.
It can
store the page value at the time of post back (Sending and Receiving information from Server) of your page.
ASP.NET
pages provide the
ViewState
property as a built-in structure for automatically storing values between multiple requests for the same page.
View state
data is
encrypted and cannot be viewed with software like
FireBug
Understanding ASP.NET View State[
^]
Here you can get detailed description with how you can interpret (and protect) the data stored in
View State.
Also refer:
An Introduction to View State[
^]