I have created a web site. At home page, I am saving lots of data in caching and session. It has process button on click of that it does lots of calculation on the basis of caching and session and display the result on result page. Result page has back button on click of that it goes to home page. Sometimes (not frequently) when i go to home page by a back button and then click on process button (on home page) it does not display any result on result page.If i reload the application again it works fine. I am unable to understand the problem.