response.redirect - Adding viewstate to new instance of page (.Net) -

I develop an aspx-page and when some control is turned on the page, then I get a new instance of the browser I want to redirect the page, adding some URL parameters but I would also like to restore the potential changes, which the user has created between the first page and clicking on the control on which the Response Redirect is the reason. If I just redirect, changes are lost. I

Use instead.