When a form is submitted in classic ASP, all form values 
are cleared. Suppose you have submitted a form with a lot 
of information and the server comes back with an error. You 
will have to go back to the form and correct the 
information. You click the back button, and what 
happens.......ALL form values are CLEARED, and you will 
have to start all over again! The site did not maintain 
your ViewState.

ViewState is confined only to the page cycle ,
When the Viewstate is declared in the particular Method in 
the Page ,it can be called in other methods or Events when 
it is in Need.
ie.., it persists its state across postbacks
**********************'
ViewState Declared As:'
**********************'
ViewState["ViewStateVariableName"] = 1;
**********************************'
Above ViewState Can be called As: '
**********************************'
int number = (int) ViewState["ViewStateVariable"];

AFAIK

Sorry,
in the above example of declaration and calling View state
Key Name Should the same but it was not so while declaring 
the key name was "ViewStateVariableName" and while calling 
the key name was "ViewStateVariable" which won't work if 
so, it was by mistake,
 ie..,when called name was changed.., 
Cool:-)
 Below is the Correct Format:

**********************'
ViewState Declared As:'
**********************'
ViewState["ViewStateVariableName"] = 1;
**********************************'
Above ViewState Can be called As: '
**********************************'
int number = (int) ViewState["ViewStateVariableName"];

AFAIK

View State is going to store a value even though u refresh 
the page.........

ViewState is maintaing users state at Client Side.It 
provides property to store retention value between multiple 
webrequest.It stores value in html hidden field in web page.

every control maintain its view state in form hidden field 
in server round trip by default each control maintain its 
state in hidden field.By default it is true

Viewstate is stored in hidden input field and sent back to 
the server with every post back.
veiwstate is a concept of maintaing the controls props.
adv: 
redusing the manuel coding
it can not use persistant memory in client system or server 
system.
dis adv:
more amount of data can be transfered between client and 
web server
configaration :
we can figure viewstate at three levels
1.pagelevel
2.control level
3.application level
      cl:<input.......... enableviewstate="true[d]/false">
      pl:<%@page...........enableviewstate="tr true
[d]/false"%>
      al:this is required configurationfile
            <pages .......... enableviewstate="true
[d]/false>

View State is a mechanism by which we can maintain the 
state during the subsequent postback of same .aspx 
page...means suppose we have a registration form to fill i 
fill all the entries but some entries were wrong than wht 
happen next i'll get only those value which was wrong means 
i won't fill all the value again just fill the wrong value 
only...

its used to store the value in client side 

viewstate ["viewstatevariablename"] = .....;