Developing World-Ready Applications
Describes how to use .NET framework to develop international applications.
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cpguide/html/cpcondesigningglobalapplications.asp

Multilingual Support in C#
Tafseer Ahmed shows how to display Urdu in dialog boxes using C# and Windows 2000.
http://www.codeproject.com/useritems/multilingual.asp