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ViewState issue with CallbackPanel


When I use the Update Panel in a page of my ASP.NET project, It seems to lose the ViewState of all the ASP.NET controls when I make a server request.

What could be happening?


When using CallbackPanel you need to set "EnableCallbackViewstate" property to "true" in page directive to enable ViewState in page. Check this sample to see how it works: http://www.obout.com/AJAXPage/ex_callbackviewstate.aspx

You can find the source code from file: oboutSuite/AjaxPage/aspnet_callbackviewstate.aspx