Using Programming Languages other than VBA

Sub Example_Clear()
	' This example creates a selection set and several objects.
	' It then adds the objects to the selection set. It then
	' clears the objects from the selection set.

	' Create the new selection set
	Dim ssetObj As AcadSelectionSet
	Set ssetObj = ThisDrawing.SelectionSets.Add("TEST_SELECTIONSET")

	' Create a Ray object in model space
	Dim rayObj As AcadRay
	Dim basePoint(0 To 2) As Double
	Dim SecondPoint(0 To 2) As Double
	basePoint(0) = 3#: basePoint(1) = 3#: basePoint(2) = 0#
	SecondPoint(0) = 1#: SecondPoint(1) = 3#: SecondPoint(2) = 0#
	Set rayObj = ThisDrawing.ModelSpace.AddRay(basePoint, SecondPoint)

	' Create a polyline object in model space
	Dim plineObj As AcadLWPolyline
	Dim points(0 To 5) As Double
	points(0) = 3: points(1) = 7
	points(2) = 9: points(3) = 2
	points(4) = 3: points(5) = 5
	Set plineObj = ThisDrawing.ModelSpace.AddLightWeightPolyline(points)
	plineObj.Closed = True

	' Create a line object in model space
	Dim lineObj As AcadLine
	Dim startPoint(0 To 2) As Double
	Dim endPoint(0 To 2) As Double
	startPoint(0) = 0: startPoint(1) = 0: startPoint(2) = 0
	endPoint(0) = 2: endPoint(1) = 2: endPoint(2) = 0
	Set lineObj = ThisDrawing.ModelSpace.AddLine(startPoint, endPoint)

	' Create a circle object in model space
	Dim circObj As AcadCircle
	Dim centerPt(0 To 2) As Double
	Dim radius As Double
	centerPt(0) = 20: centerPt(1) = 30: centerPt(2) = 0
	radius = 3
	Set circObj = ThisDrawing.ModelSpace.AddCircle(centerPt, radius)

	' Create an ellipse object in model space
	Dim ellObj As AcadEllipse
	Dim majAxis(0 To 2) As Double
	Dim center(0 To 2) As Double
	Dim radRatio As Double
	center(0) = 5#: center(1) = 5#: center(2) = 0#
	majAxis(0) = 10: majAxis(1) = 20#: majAxis(2) = 0#
	radRatio = 0.3
	Set ellObj = ThisDrawing.ModelSpace.AddEllipse(center, majAxis, radRatio)

	ZoomAll

	' Iterate through the model space collection.
	' Collect the objects found into an array of objects
	' to be added to the selection set.
	ReDim ssobjs(0 To ThisDrawing.ModelSpace.count - 1) As AcadEntity
	Dim I As Integer
	For I = 0 To ThisDrawing.ModelSpace.count - 1
		Set ssobjs(I) = ThisDrawing.ModelSpace.Item(I)
	Next

	' Add the array of objects to the selection set
	ssetObj.AddItems ssobjs
	GoSub LISTOBJS

	' Clear the selection set
	ssetObj.Clear

	ThisDrawing.Regen acActiveViewport
	GoSub LISTOBJS

Exit Sub

LISTOBJS:

		' List all the objects in the selection set
		If ssetObj.count = 0 Then
			MsgBox "The selection set is empty"
		Else
			For I = 0 To ssetObj.count - 1
				MsgBox "The selection set contains: " & ssetObj.Item(I).ObjectName
			Next
		End If
		Return

End Sub