Avoid Form Resubmission When REFRESH Clicked

I am working with website in which a user can login and then submit some forms. I want the user to avoid re-submitting the same form twice when he uses the browser refresh or when he goes to another page and then comes back to that same page using the browser back button.

I know of two solutions:

1. Redirect to a different page after form submission - The problem with this approach is that the website has many forms. So redirecting each form to a different one is not a very feasible solution.

2. A token can be stored in session (or somewhere) after each form submission. These tokens can be verified if the form is being resubmitted - The problem with this approach is that the user can submit

one form only once. I want the user to be able to submit the same form multiple times, provided with differetn data.

Is there a suitable solution where a form with same data is submitted only once, but there is no such restriction with different data?

Can the ASP request object be cleared after form submission, so even when refresh button is pressed, Request.Form elements dont have any data? (Storing ALL the information filled in each form during that session and then comparing for resubmit is not a clean solution I think??).