How do you send variables from an ASP page to an ASP.NET page?

I've tried some stuff with request.querystring, but it doesn't seem to be working as I need it to. The problem is that I want to use this data in an ASP.NET code declaration box which is compiled before request.querystring is available.How do you send variables from an ASP page to an ASP.NET page?
You'd have to either use POST or GET. IE, Post them as hidden inputs in a form or place them on the query string. You can't share a server session between the two environments.