Persist Session Info

i have logically divided each .asp page in one or more "states" then i need to store somewhere information about what state has each client on each page i consider 3 ways:

store info in the DB : {page,sessionid} is the PK - in a file: which i have to read on enter to the page and write on exit the page - in the session object: storing an array on a session variable, like session("x")[1...N] each way has a pros and cons, i'm choosing the last method, but i know it consumes much memory.