Clear viewstate on a datagrid

I have a datagrid that is maintaining viewstate from several hits ago. I call up the datagrid with a query(we will call this Visit1). I do some stuff, go visit another page, sometimes even shut down the computer. Later I visit the grid again with a different query (Visit2). It renders exactly Visit2's query the first time but on postback it gives me the results of Visit1.

Is there a way to make sure all my controls' viewstates are clear everytime the application is launched?

Thank you!
Eva

Did you ever Figure this out? I have a similar issue. Where View state seems to be holding info that I don’t want anymore. Please let me know if you have this solved.