Access session in custom authorize filter

Question

How do I use the Session["userName"] in my custom authorize filter?

void IAuthorizationFilter.OnAuthorization(AuthorizationContext filterContext)
{            
    string userName = Session["userName"]; // Shows error "The name 'Session' does not exist in the current context              

    base.OnAuthorization(filterContext);
}

Answer 1

The Session dictionary is available trough:

void IAuthorizationFilter.OnAuthorization(AuthorizationContext filterContext)
{            
    string userName = filterContext.HttpContext.Session["userName"];               

    base.OnAuthorization(filterContext);
}