<ExtensionAttribute()>
Public Overloads Shared Function SelectMany(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.SelectMany(Of TSource)(source, selector)

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

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

var mgr = new DomainModelEntityManager();

var baseQuery = mgr.Customers;
var query = baseQuery.Take(2).SelectMany(new ProjectionSelector("OrderSummaries"));
var results = query.Execute();