How do I Pass a Variable from one Controller to another using MVC Contrib?

Question

Jeremy Skinner has a blog and a video about exporting a spreadsheet from MVC Contrib. The problem is there is no filtering done in his video or blog. In the controller associated with page containing the grid, I have the filters and in the controller associated with the "Export to Spreadsheet, I need that filter without being reset. The problem is, the variable gets reset everytime I click on the "Export to Spreadsheet" link. How do I get that variable from one controller to another without resetting?

Here is Jeremy's link, http://www.jeremyskinner.co.uk/2010/04/28/mvccontrib-grid-presentation. Thank you!!