What is ViewState?
ViewState allows the state of
objects (serializable) to be stored in a hidden field on the page. ViewState is transported to the client and
back to the server, and is not stored on the server or any other external source. ViewState is used the retain the state of
server-side objects between postabacks.
What is the lifespan for items stored in ViewState?
Item stored in ViewState
exist for the life of the current page.
This includes postbacks (to the same page).
What does the "EnableViewState" property do? Why would I want it on or off?
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.
What are the different types of Session state management
options available with ASP.NET?
ASP.NET provides In-Process
and Out-of-Process state management.
In-Process stores the session in memory on the web server. This requires the a "sticky-server"
(or no load-balancing) so that the user is always reconnected to the same web
server. Out-of-Process Session state management
stores data in an external data source.
The external data source may be either a SQL Server or a State Server
service. Out-of-Process state management
requires that all objects stored in session are serializable.
