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Summary

State management influences almost every aspect of a Web application's design, and it is important to understand all the options available for state management as well as their implications for usability, performance, and scalability. ASP.NET provides four types of state, each of which may be the best choice in different parts of your application. State that is global to an application may be stored in the application state bag, although it is typically preferable to use the new data cache instead of application state in ASP.NET. Client-specific state can be stored either in the session state bag, as client-side cookies, or as view state. Session state is most commonly used for storing data that should not be sent back and forth with each request, either because it is too large or because the information should not be visible on the Internet. Cookie state is useful for small client-specific pieces of information such as preferences, authentication keys, and session keys. View state is a useful alternative to session state for information that needs to be retained across posts back to the same page. Finally, enhancements to the session state model in ASP.NET give developers the flexibility to rely on session state even for applications that are deployed on Web farms or Web gardens through remote session storage.

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