Public Class CompositeSortSelector 
   Inherits IdeaBlade.Linq.SelectorCollection(Of SortSelector,CompositeSortSelector)
   Implements IdeaBlade.Core.ISortSelector 

Dim instance As CompositeSortSelector

public class CompositeSortSelector : IdeaBlade.Linq.SelectorCollection<SortSelector,CompositeSortSelector>, IdeaBlade.Core.ISortSelector  

public ref class CompositeSortSelector : public IdeaBlade.Linq.SelectorCollection<SortSelector,CompositeSortSelector>, IdeaBlade.Core.ISortSelector  

var mgr = new DomainModelEntityManager();
var entityType = typeof(Customer);
var baseQuery = EntityQuery.Create(entityType, mgr);
var ss1 = new SortSelector(Customer.EntityPropertyNames.Id);
var ss2 = new SortSelector(Customer.EntityPropertyNames.CompanyName);

var combined = ss1.ThenBy(ss2);
var results = baseQuery.OrderBySelector(combined).Execute();