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Object does not retrieves from viewstate

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+2 A:

SaveViewState is before the Render Method. ViewState is encoded and written out to the page to be posted back in. If you add ViewState info after the Render, it is not written back out the the page. Hence it will not be read back in on the postback. Think of ViewState as a hidden input.

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Tim Hoolihan 2009-06-23 13:04:35

Thanks I tried to go such way before, but before render it causes tremendous error . It occurs not while passing through line in that I save object to viewstate (debugger passed that line ok), but when page is rendered (it seems so). Exception of type 'System.Web.HttpUnhandledException' was thrown. --- Error serializing value 'MDSWebApp.Controls.AttachedPartners+AttachedPartnersViewState' of type 'MDSWebApp.Controls.AttachedPartners+AttachedPartnersViewState.'

igor 2009-06-23 13:53:09

that error means you are trying to save something into viewstate that is not serializable. All data saved out to the page has to be serialized. What are you trying to save in viewstate?

Tim Hoolihan 2009-06-23 14:17:13

Thanks, I more or less aware what is nature of this error )I try to save class which functionally is container for carrying my data through postback. It contains only 3 Lists<> and 1 int.But when I do the same via Session instead of Viewstate (just replace ViewState with Session), it serializes and retrieves without errors, that is strange.The only way I see now is use the session instead, though it is not quite logically right at the design point of view.anyway, such behavior of viewstate still be strange and make me warned for its further use,

igor 2009-06-23 14:44:01

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