In most circumstances, do not set this property in code. The LCID attribute can be set in the @ Page directive of the .aspx file, however, the preferred method of setting the locale identifier is through the use of the Culture and UICulture properties.
Windows 98, Windows Server 2000 SP4, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition
The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.