I am creating 4 asp.net pages. first three pages have 'CONTINUE' button and last page has 'SUBMIT' button. I am not allowed to use Sessions to store first three pages data. and i need to use 'BACK' button on last three pages. when i click 'BACK' button i need to maintain the previous page data entered by user.

As my pages do some postbacks, i cannot use javascript.history function.

My restrictions are:

As the application is served from a web farm, a session object cannot be used. However, for the purpose of this excersise, consider session object as database-like persistent space where you can store your data. your code should show an easy way to switch to a different persistent space.

What is databse like persistent space and how to write a code to switch to different persistent space?...

Please give me some idea on how to proceed....

Thank you