How to select tasks where userName is "xx"

Question

I have 2 tables (Task table and user table)
task table have list of users
how to select tasks where userName is "xx" using criteria in nhibernate 2

Answer 1

    var tasks = _session.QueryOver<Task>()
            .Fetch(x => x.User).Eager
            .Where(x => x.User.Username == "xx")
            .List();

or

        User userAlias = null;
        var tasks = _session.QueryOver<Task>()
            .JoinAlias(x => x.User, () => userAlias, JoinType.InnerJoin)
            .Where(x=>userAlias.UserName=="xx")
            .List();