Using Programming Languages other than VBA

Sub Example_Key()
	' This example creates two Circle objects and uses the CopyObjects
	' method to copy them. It then returns the
	' object IDs of the source objects using the Key property and uses these
	' values to remove the original (source) objects

	Dim circleObj1 As AcadCircle, circleObj2 As AcadCircle
	Dim circleObj1Copy As AcadCircle, circleObj2Copy As AcadCircle
	Dim centerPoint(0 To 2) As Double
	Dim radius1 As Double, radius2 As Double
	Dim radius1Copy As Double, radius2Copy As Double
	Dim objCollection(0 To 1) As Object
	Dim retObjects As Variant
	Dim IDPairs As Variant
	Dim SourceObject As AcadObject

	' Define the Circle object
	centerPoint(0) = 0: centerPoint(1) = 0: centerPoint(2) = 0
	radius1 = 5#: radius2 = 7#
	radius1Copy = 1#: radius2Copy = 2#

	' Add two circles to the drawing
	Set circleObj1 = ThisDrawing.ModelSpace.AddCircle(centerPoint, radius1)
	Set circleObj2 = ThisDrawing.ModelSpace.AddCircle(centerPoint, radius2)
	ThisDrawing.Application.ZoomAll

	' Copy objects
	'
	' First put the objects to be copied into a form compatible with CopyObjects
	Set objCollection(0) = circleObj1
	Set objCollection(1) = circleObj2

	' Copy object and get back a collection of the new objects (copies)
	retObjects = ThisDrawing.CopyObjects(objCollection, , IDPairs)

	' Get newly created object and apply new properties to the copies
	Set circleObj1Copy = retObjects(0)
	Set circleObj2Copy = retObjects(1)

	circleObj1Copy.radius = radius1Copy
	circleObj2Copy.radius = radius2Copy
	
	ThisDrawing.Application.ZoomAll
	ThisDrawing.Regen acAllViewports

	' Display the object IDs of the source objects used for the copy
	MsgBox "The first source object ID is: " & IDPairs(0).Key & vbCrLf & _
		 "The second source object ID is: " & IDPairs(1).Key

	' This key can be used with objectIDtoObject to reference the source objects,
	' which is handy if the user manually selected the source objects.
	'
	' Delete the source objects from the ID obtained
	Set SourceObject = ThisDrawing.ObjectIdToObject(IDPairs(0).Key)
	SourceObject.Delete
	Set SourceObject = ThisDrawing.ObjectIdToObject(IDPairs(1).Key)
	SourceObject.Delete

	ThisDrawing.Regen acAllViewports

	MsgBox "The source objects have just been deleted!", vbInformation
End Sub