<ExtensionAttribute()>
Public Overloads Shared Function ExecuteAsync(Of T)( _
   ByVal query As IEntityQuery(Of T) _
) As EntityQueryOperation(Of T)

Dim query As IEntityQuery(Of T)
Dim value As EntityQueryOperation(Of T)
 
value = EntityQueryExtensions.ExecuteAsync(Of T)(query)

[ExtensionAttribute()]
public static EntityQueryOperation<T> ExecuteAsync<T>( 
   IEntityQuery<T> query
)

[ExtensionAttribute()]
public:
static EntityQueryOperation<T^>^ ExecuteAsyncgeneric<typename T>
( 
   IEntityQuery<T^>^ query
) 

DomainModelEntityManager mgr = new DomainModelEntityManager();

var query = mgr.Customers.Where(c => c.Country == "UK");
query.ExecuteAsync(op => {
  var customers = op.Results;
});