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Introduction to International Applications Based on the .NET Framework 

In Visual Studio, there are two parts to creating a world-ready application: globalization, the process of designing applications that can adapt to different cultures, and localization, the process of translating resources for a specific culture. For general information on designing applications for an international audience, see Best Practices for Developing World-Ready Applications.

The .NET Framework localization model consists of a main assembly that contains both the application code and the fallback resources — strings, images, and other objects for the language in which the application is originally developed. Each localized application will have satellite assemblies, or assemblies which contain only the localized resources. Because the main assembly always contains the fallback resources, if a resource is not found in the localized satellite assembly, the ResourceManager will attempt to load it in a hierarchical manner, eventually falling back to the resource in the main assembly. The resource fallback system is explained in greater detail in Hierarchical Organization of Resources for Localization.

One localization resource you should consider using is the glossary for all Microsoft localized products. Individual glossaries for 31 languages are available for download from the glossary directory on ftp.microsoft.com (ftp://ftp.microsoft.com/developr/msdn/newup/glossary/).

The project system for Windows Forms applications can generate resource files for both the fallback and each desired additional UI culture. The fallback resource file is built into the main assembly, and the culture-specific resource files are then built into satellite assemblies, one for each UI culture. When you build a project, the resource files are compiled from the Visual Studio XML format (.resx) to an intermediate binary format (.resources), which are then embedded in satellite assemblies.

The project system for both Windows Forms and Web Forms allows you to build resource files using an Assembly Resource File template, access the resources, and build your project. Satellite assemblies will be created along with the main assembly.

When a localized application executes, its appearance is determined by two culture values. (A culture is a set of user preference information related to the user's language, environment, and cultural conventions.) The UI culture setting determines which resources will be loaded. The UI culture is set as UICulture in Web.config files and page directives, and CurrentUICulture in Visual Basic or Visual C# code. The culture setting determines formatting of values such as dates, numbers, currency, and so on. The culture is set as Culture in Web.config files and page directives, CurrentCulture in Visual Basic or Visual C# code.

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