public static Task<TResult> MaxAsync<TSource, TResult>(
	this IQueryable<TSource> source,
	Expression<Func<TSource, TResult>> selector,
	CancellationToken cancellationToken
)

<ExtensionAttribute>
Public Shared Function MaxAsync(Of TSource, TResult) ( 
	source As IQueryable(Of TSource),
	selector As Expression(Of Func(Of TSource, TResult)),
	cancellationToken As CancellationToken
) As Task(Of TResult)