Pass Variables

What is the best method of passing variables from one page to another?I don't know that there really is a 'best' way - - it's just whichever way you are most comfortable with..

generally, I still use querystrings, though, with ASP.Net, I generally now use only one page to do processing, so I don't need to do cross-page programming as much
What do you feel is the best way to pass arrays from page to page?

Trey