Need to access a variable after session timeout.

If I need to access a variable after session time out where should I store the variable.

Added session time out in web.config as

using targetFramework="4.5"

after session time out i need to access a variable .so please let me know where to store variable (Session State,Application State).please give a example to store and access.

for example

if(HttpContext.Current.Session["IsLoggedIn"] == null)

{

//Here i need to check the variable after session time out

if(Isadminlogin) {

Response.Redirect("./adminlogin.aspx");

}else{

Response.Redirect("./memberlogin.aspx");

}