<ExtensionAttribute()>
Public Overloads Shared Function Select(Of TSource)( _
   ByVal source As IQueryable(Of TSource), _
   ByVal selector As IProjectionSelector _
) As IQueryable

Dim source As IQueryable(Of TSource)
Dim selector As IProjectionSelector
Dim value As IQueryable
 
value = QueryableExtensions.Select(Of TSource)(source, selector)

[ExtensionAttribute()]
public static IQueryable Select<TSource>( 
   IQueryable<TSource> source,
   IProjectionSelector selector
)

[ExtensionAttribute()]
public:
static IQueryable^ Selectgeneric<typename TSource>
( 
   IQueryable<TSource^>^ source,
   IProjectionSelector^ selector
) 

var mgr = new DomainModelEntityManager();

var rootQuery = mgr.Customers;

var ps1 = new ProjectionSelector("CompanyName");
var ps2 = new ProjectionSelector("ContactName");
var pps = ps1.Combine(ps2);

var query = rootQuery.Select(pps);
var results = query.Execute();