Using Programming Languages other than VBA

Sub Example_HistoryLines()
	' This example returns the current setting of
	' HistoryLines. It then changes the value, and finally
	' it resets the value back to the original setting.

	Dim preferences As AcadPreferences
	Dim currHistoryLines As Integer

	Set preferences = ThisDrawing.Application.preferences

	' Retrieve the current HistoryLines value
	currHistoryLines = preferences.DISPLAY.HistoryLines
	MsgBox "The current value for HistoryLines is " & preferences.DISPLAY.HistoryLines, vbInformation, "HistoryLines Example"

	' Change the value for HistoryLines
	preferences.DISPLAY.HistoryLines = 42
	MsgBox "The new value for HistoryLines is " & preferences.DISPLAY.HistoryLines, vbInformation, "HistoryLines Example"

	' Reset HistoryLines to its original value
	preferences.DISPLAY.HistoryLines = currHistoryLines
	MsgBox "The HistoryLines value is reset to " & preferences.DISPLAY.HistoryLines, vbInformation, "HistoryLines Example"
End Sub