I have a c# asp.net page that runs inside a frame. This page sets some session variables and then redirects to a new .aspx page which calls some JS to jump the site out of the frame.

So it's something like:

Page1.aspx: Set Session["xyz"]="123" -> Response.Redirect("Page2.aspx", false) -> Page2.aspx: <script>top.location = 'Page3.aspx'</script>

When Page3.aspx loads, the variables I set on Page1 have a value of null. I can see at Page2, before the js does the redirect, that the variables still have their value.

On Page3, any variables that were set prior to Page1 loading also still have their values. There is nowhere in the code where the values are explicitly getting set to null.

I hope I've explained that well enough but I really have no idea what is going on and can't seem to find an answer anywhere. Any help gratefully received! Thanks