Where to store Variables that have to last during Refreshes and Postbacks

[Vincent V]

Hey this has been messing me for ages
and i dont know if there is any answer

I need to store things like What page in the Datagrid people are on
the row filters of the datagrid - sort bys on the datagrid
Lots of little UI things
up until now i have been using hiden asp:textbox's but it think there must
be a better way

I also would prefer not to use Query Strings or Session?

Can i store in Statebag , Context or anything like that?

thanks!