Gets an encoded string that contains the view and control states data of the Web page to which this derived page adapter is attached.
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The PageAdapter.ClientState property provides access to the internal ClientState property of the System.Web.UI.Page class.
View state data stored by the System.Web.UI.PageStatePersister object in the internal ClientState property of System.Web.UI.Page will always be saved in the hidden field on the Web page.