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