First, here's a link to what I'm referring to:

I need to create a total of 6 pages where I can keep the information persistant.
I thought about doing Session, but I've heard that if you use Dictionary
in a Session, you're server is going to slow down dramatically the more people
are accessing the pages.

I don't know how to keep the information persistant (im getting input from
the user with text fields). The link above shows something that is promising,
but I really can't follow how they are implementing it and I have reservation
about creating a .txt file on the fly because what if more than 1 person
is accessing it? Will the data be overwritten? How would I be able to delete
this .txt file after each person is done with their own created .txt file?

Has anyone ever used this LookupTable before?