Assembly: System.Web (in system.web.dll)
AddHeader is the same as AppendHeader and is provided only for compatibility with previous versions of ASP. With ASP.NET, use AppendHeader.
Windows 98, Windows 2000 SP4, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see System Requirements.