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In this chapter, we looked at how to develop some very basic web applications using the Rails, Sinatra, and Ramaze frameworks. Rails in particular gives you a lot of power out of the box, and enabled you to develop a fully working, database-driven web application in a short period of time. Sinatra and Ramaze, on the other hand, have shown you how simple it can be to put smaller web apps together. We ve merely scratched the surface in this chapter, as Rails is a large and complex framework (though simple to use, it has many details that are complex for advanced usage). Entire books larger than this one have been written about Rails, so this chapter merely provides a taste. You can use the references in the previous section to learn more about the framework, and you can investigate the selection of Apress books available about Rails (see http://www. apress.com). Sinatra and Ramaze also both go a lot deeper than we ve been able to scratch. Larger frameworks like Rails can seem complex initially, but the complexity of the directory structure and default files created by the rails tool are only there to make your job as a developer easier by providing a familiar structure and separation of concerns. Once you re familiar with the layout and the tools Rails makes available, developing web applications is a simple, organized process. Let s reflect on the main concepts introduced in this chapter: Ruby on Rails: A Ruby-based web application development framework developed by David Heinemeier Hansson. See 5 for the history behind Ruby on Rails. Framework: A set of libraries and tools that can be used as a foundation for developing applications.

The downside of this approach is that it does impede performance somewhat applications need to make a network round-trip to the state server when loading or saving session information To reduce the overall size of the stored information, when storing session data in the state server, with ASP NET 4 you now have the option of using compression to reduce the amount of data being transferred Just include the compressionEnabled=true setting in the sessionState section of web config Store session state in a database Configuring your application to use a SQL Server database for state management causes ASP NET to store session information in a SQL Server database somewhere on your network Use this option when you want to run your server from in a Web farm when you want session state to be durable and safe .

Encodings also allow a managed application to interact with strings created by non-Unicode systems . For example, if you want to produce a file readable by an application running on a Japanese version of Microsoft Windows 95, you have to save the Unicode text by using the Shift-JIS (code page 932) encoding . Likewise, you d use Shift-JIS encoding to read a text file produced on a Japanese Windows 95 system into the CLR . Encoding is typically done when you want to send a string to a file or network stream by using the System.IO.BinaryWriter or System.IO.StreamWriter type . Decoding is typically done when you want to read a string from a file or network stream by using the System.IO.BinaryReader or System.IO.StreamReader type . If you don t explicitly select an encoding, all of these types default to using UTF-8 . (UTF stands for Unicode Transformation Format .) However, at times, you might want to explicitly encode or decode a string . Even if you don't want to explicitly do this, this section will give you more insight into the reading and writing of strings from and to streams . Fortunately, the FCL offers some types to make character encoding and decoding easy . The two most frequently used encodings are UTF-16 and UTF-8 .

As with the state server approach, when storing session data in the SQL Server database, you have the option of using compression to reduce the amount of data being transferred Again just include the compressionEnabled=true setting in the sessionState section of web config ..

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14 These methods are useful, but they don t let you do anything particularly impressive with your strings. Let s move on to playing directly with the text itself.