Using Programming Languages other than VBA

Sub Example_ActiveLayer()
	' This example returns the current layer
	' and then adds a new layer.
	' Finally, it returns the layer to the previous setting.
	Dim currLayer As AcadLayer
	Dim newLayer As AcadLayer

	' Return the current layer of the active document
	Set currLayer = ThisDrawing.ActiveLayer
	MsgBox "The current layer is " & currLayer.name, vbInformation, "ActiveLayer Example"

	' Create a Layer and make it the active layer
	Set newLayer = ThisDrawing.Layers.Add("TestLayer")
	ThisDrawing.ActiveLayer = newLayer
	MsgBox "The new layer is " & newLayer.name, vbInformation, "ActiveLayer Example"

	' Reset the layer to its previous setting
	ThisDrawing.ActiveLayer = currLayer
	MsgBox "The active layer is reset to " & currLayer.name, vbInformation, "ActiveLayer Example"
End Sub