Hold a temporary datatable without reload

Question

Hi.
I have a datatable where text entered in textbox will be saved in temporary data table,without sending to database.
Now,when i click at other menu in the page and click back at the temporary data table,the datatable will be cleared because it reloads when we click at any menus in the page.
I want the page to be static,without reload/refresh.The page is in content holder in master page.

Any ideas guys?