Last updated: August 25, 2026.
A constant gives a readable name to a value that should not change while a Classic ASP page runs. In VBScript, declare application constants with the Const statement.
Declare and use constants
<%
Const TAX_RATE = 0.0825
Const STATUS_ACTIVE = "active"
Const MAX_PAGE_SIZE = 100
Dim subtotal
subtotal = 250
Response.Write FormatCurrency(subtotal * (1 + TAX_RATE))
%>A Const expression can contain literals and other constants, but not a function call or value read at runtime. Use an ordinary variable for environment-specific configuration.
Component constants
ADO and other COM components define their own constants. Include a trusted constants file or declare the component type library in the application, then use names such as adCmdText instead of unexplained numbers.
<!-- #include virtual="/includes/adovbs.inc" -->
<%
command.CommandType = adCmdText
%>Keep include files outside writable upload directories and do not build include paths from request values. Microsoft documents constants and component type libraries in Using Variables and Constants.
