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

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

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

[ExtensionAttribute()]
public:
static IQueryable^ Select( 
   IQueryable^ source,
   IProjectionSelector^ selector
) 

var mgr = new DomainModelEntityManager();

var entityType = typeof(Customer); 
var rootQuery = EntityQuery.Create(entityType, mgr);

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

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