What is the difference between SessionState and ViewState

Question

What is the difference between SessionState and ViewState in ASP NET

User · Answer

SessionState   Can be persisted in memory  which makes it a fast solution  Which means state cannot be shared in the Web Farm Web Garden  Can be persisted in a Database  useful for Web Farms   Web Gardens  Is Cleared when the session dies - usually after 20min of inactivity    ViewState   Is sent back and forth between the server and client  taking up bandwidth  Has no expiration date  Is useful in a Web Farm   Web Garden

User · Answer

Usage   If you re going to store information that you want to access on different web pages  you can use SessionState  If you want to store information that you want to access from the same page  then you can use Viewstate  Storage The Viewstate is stored within the page itself  in encrypted text   while the Sessionstate is stored in the server   The SessionState will clear in the following conditions   Cleared by programmer Cleared by user Timeout

User · Answer

Session state is saved on the server  ViewState is saved in the page   Session state is usually cleared after a period of inactivity from the user  no request happened containing the session id in the request cookies    The view state is posted on subsequent post back in a hidden field

User · Answer

Session State contains information that is pertaining to a specific session  by a particular client browser machine  with the server  It s a way to track what the user is doing on the site   across multiple pages   amid the statelessness of the Web  e g  the contents of a particular user s shopping cart is session data  Cookies can be used for session state  View State on the other hand is information specific to particular web page  It is stored in a hidden field so that it isn t visible to the user  It is used to maintain the user s illusion that the page remembers what he did on it the last time - dont give him a clean page every time he posts back  Check this page for more

User · Answer

Session is used mainly for storing user specific data   session specific data    In the case of session you can use the value for the whole session until the session expires or the user abandons the session  Viewstate is the type of data that has scope only in the page in which it is used  You canot have viewstate values accesible to other pages unless you transfer those values to the desired page  Also in the case of viewstate all the server side control datas are transferred to the server as key value pair in   Viewstate and transferred back and rendered to the appropriate control in client when postback occurs

[asp.net] What is the difference between SessionState and ViewState?

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