how to save and load tree view view state using

I have a update panel and in which i have a tree view control.
I want to save tree view viewstate some where and want to load it back when user back to the page.

I  cannot use the Viewstate as it is set to fasle for this page some some special reasons.
Right now i am using two function which i found

but this does not seems to work.

any one could help me here pls it important for me.
Who is Participating?
Praveen VenuConnect With a Mentor Technical Project ManagerCommented:
Do you try enabling viewstate for the page?
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