public static IQueryable<T3> ApplyPerPartition<T1, T2, T3>(
	this IQueryable<T1> source1,
	IQueryable<T2> source2,
	Expression<Func<IEnumerable<T1>, IEnumerable<T2>, IEnumerable<T3>>> applyFunc,
	bool isFirstOnly = false
)

<ExtensionAttribute> 
Public Shared Function ApplyPerPartition(Of T1, T2, T3) ( 
	source1 As IQueryable(Of T1),
	source2 As IQueryable(Of T2),
	applyFunc As Expression(Of Func(Of IEnumerable(Of T1), IEnumerable(Of T2), IEnumerable(Of T3))),
	Optional isFirstOnly As Boolean = false
) As IQueryable(Of T3)

public:
[ExtensionAttribute]
generic<typename T1, typename T2, typename T3>
static IQueryable<T3>^ ApplyPerPartition(
	IQueryable<T1>^ source1, 
	IQueryable<T2>^ source2, 
	Expression<Func<IEnumerable<T1>^, IEnumerable<T2>^, IEnumerable<T3>^>^>^ applyFunc, 
	bool isFirstOnly = false
)