what fields nested category opening category it's nested in?

i have web use c# have nested middle class, abstracts divided event collection, something this:

public category use : system.web.services.webservice
{
    [webmethod]
    open twine foo(string ticket)
    {
        sessionpool.getsession(ticket);
    }

    private category sessionpool 
    {
        open stationary event getsession(string ticket)
        {
            // i wish do, nonetheless i can't opening context
            relapse (session)context.session[ticket];
        }
    }
}

is illusory opening http context webservice category around nested class? not, there proceed i store anxiety it?