public static IQueryable<TSource> ForSystemTime<TSource>(
	this IQueryable<TSource> source,
	string predicate,
	DateTime argument1 = null,
	DateTime argument2 = null
)

<ExtensionAttribute>
Public Shared Function ForSystemTime(Of TSource) ( 
	source As IQueryable(Of TSource),
	predicate As String,
	Optional argument1 As DateTime = Nothing,
	Optional argument2 As DateTime = Nothing
) As IQueryable(Of TSource)