public static Duct CreatePlaceholder(
	Document document,
	ElementId systemTypeId,
	ElementId ductTypeId,
	ElementId levelId,
	XYZ firstPoint,
	XYZ secondPoint
)

Public Shared Function CreatePlaceholder ( _
	document As Document, _
	systemTypeId As ElementId, _
	ductTypeId As ElementId, _
	levelId As ElementId, _
	firstPoint As XYZ, _
	secondPoint As XYZ _
) As Duct

public:
static Duct^ CreatePlaceholder(
	Document^ document, 
	ElementId^ systemTypeId, 
	ElementId^ ductTypeId, 
	ElementId^ levelId, 
	XYZ^ firstPoint, 
	XYZ^ secondPoint
)