User-286291038 posted
Hi there,
Even if a user control was not used, the same problem will probably exist if the same session variable was used in different pages and the different pages were opened at the same time concurrently by the same user.
So, if you want something exclusively for the page, then I do not think session variable is a good option. You can try for a different solution, such as maybe using private variable just in cope of that page. Or a static variable in case the data is shared
(but always be very careful while using static variables).