ViewState with AJAX in ASP.NET

Posted on 2009-06-30
Last Modified: 2012-05-07

I have a page with AJAX enabled. I want to store some information on server side in the ViewState object as

ViewState("Key") = Value

Does this persists between the postbacks - because page is a partial rendering ? If it is not going to be persisted between the postbacks then what i need to do to get the value from ViewState ?

Question by:milani_lucie
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Assisted Solution

by:Kyle Abrahams
Kyle Abrahams earned 240 total points
ID: 24749601
Does it need to be in the viewstate or can you store it in the session?

Session("key") = value

Author Comment

ID: 24749641

Needs to be in ViewState. I do not want the Session overhead on the server. BTW: Is Session is going to be persisted between the postbacks ?

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Expert Comment

by:Kyle Abrahams
ID: 24749660
Session is persisted.

Looks like the viewstate is not persisted.  How bout a cookie instead?
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Expert Comment

by:Kyle Abrahams
ID: 24749683

A temporary solution to persist the viewstate, but still you're going to have the server doing the work.
LVL 15

Expert Comment

ID: 24752389
If you're using updatepanels then the ViewState is persisted. The ViewState is passed back to the server when an ajax call is made and then passed back to the page.
In other words you can use ViewState as normal on a page with updatepanels but you should do so with caution: a large ViewState can slow the updatepanels to a crawl and make for a very frustrating user experience.
LVL 15

Accepted Solution

NazoUK earned 260 total points
ID: 24752458
As an aside, the page ged325 linked to is talking about Client Callbacks which is not the same as the partial rendering achieved through ASP.NET AJAX and UpdatePanels.

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