NHibernate 3 paging and determining the total number of rows

I have read somewhere (can't remeber where and how) that NHibernate 3 allows the determination of the total number of records whilst performing a paged query (in one database query). Is this right?

I have this code:

public IEnumerable<X> GetOrganisms(int PageSize, int Page, out int total)
{
    var query = (from e in Session.Query<X>() select e).AsQueryable();

    return query.Skip((Page - 1) * PageSize).Take(PageSize).ToList();
}

and would like to initialise 'total' as efficiently as possible.

Thanks.

Christian

PS:

Potential 'solution'?:

Total = (int) Session.CreateCriteria<X>()
.SetProjection(Projections.RowCount())
.FutureValue<Int32>().Value;

var query = (from e in Session.Query<X>() select e).AsQueryable();

return query.Skip((Page - 1) * PageSize).Take(PageSize).ToList();