How can I retrieve latest from database using NHibernate after an update?

public IList<WorkOrder> FindBy(string fromDate, string toDate)
{
    IQuery query = _currentSession.CreateQuery("from WorkOrder wo where wo.Date >= ? and wo.Date <= ?");
    query.SetParameter(0, fromDate);
    query.SetParameter(1, toDate);
    return query.List<WorkOrder>();
}

Session.Update(obj);
Session.Evict(obj);