Yeah i wanted to store it in a database but i have to request my boss every time i want to create a database table, and have to justify why etc. She would have declined it for sure so using the Cache was the option.

The objects don't need to be stored forever, just so that serveral Javascript postbacks can use the same instance of a controller class which contains a document class which is to have attributes set on each postback.

Thanks for the help anyways.