Using Programming Languages other than VBA

Sub Example_LineWeight()
	' This example creates a circle in model space and then
	' finds the current lineweight for the circle. The lineweight
	' is then changed to a new value.
   
	Dim circleObj As AcadCircle
	Dim centerPoint(0 To 2) As Double
	Dim radius As Double

	' Define the circle
	centerPoint(0) = 0#: centerPoint(1) = 0#: centerPoint(2) = 0#
	radius = 5#

	' Create the Circle object in model space
	Set circleObj = ThisDrawing.ModelSpace.AddCircle(centerPoint, radius)
	ZoomAll

	' Find the lineweight for the circle
	MsgBox "The current lineweight for the circle is " & circleObj.Lineweight

	' Change the lineweight for the circle
	circleObj.Lineweight = acLnWt211
	circleObj.Update
	MsgBox "The current lineweight for the circle is " & circleObj.Lineweight
End Sub