What's the best way to refresh entities in nhibernate

I would like to refresh an entity and all its child collections. What is the best way to do this? I'm talking about nhibernate:)

I've read about session.Evict, session.Refresh...

But I'm still not sure if doing like:

RefreshEntity<T>(T entity)
{
 session.Evict(entity);
 session.Refresh(entity);
}

would work exactly how I want it to work

Is it going to work? If not What else I can do?