NHibernate.Linq And CompareTo String

Question

I'm using Linq and Hibernate and trying to compare to Strings one from a variable and the other from a Class Linked to Hibernate, the code:

   bindingSource.DataSource = (from search in Repository.GetAll()
                               where search.cod_coluna.CompareTo(CurrentRecord.cod_coluna) > 0
                               orderby search.cod_coluna select search).Take(1);

And i get an Exception in Runtime, QueryException: Cannot use subqueries on a criteria without a projection.

What i do now?