Microsoft Silverlight 3: A Beginner s Guide in Visual Studio .NET

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Microsoft Silverlight 3: A Beginner s Guide
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Figure 6-6
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The results of an RSS feed
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The results of making a valid RSS request using the preceding code and markup are displayed in Figure 6-6
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If you have a difficult time locating an RSS feed that supports Silverlight consumption, look into converting an RSS feed using FeedBurner FeedBurner is located at http:// wwwfeedburnercom
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An inherent problem with RSS is that although Netscape is primarily credited with creating it, other individuals released additional RSS standards that are not compatible with the version of RSS released by Netscape In an effort to resolve the incompatibilities and inconsistencies among the various versions of RSS, a new syndication standard named Atom was created Atom is divided into two technologies: the Atom Syndication Format and the Atom Publishing Protocol
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The Atom Syndication Format is a custom XML grammar that serves much the same purpose as the RSS XML grammar An Atom Syndication Format file is a text-based XML file with an atom file extension The following markup listing illustrates the Atom version of the training blog entry:
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< xml version="10" encoding="utf-8" > <feed xmlns="http://wwww3org/2005/Atom"> <title>My Pet Blog</title> <subtitle>I blog about my pet here for now</subtitle> <link href="http://localhost/myPetBlog" /> <updated>2008-01-30T09:30:00Z</updated> <author> <name>Shannon Horn</name> <email>shannonhorn@msncom</email> </author> <entry> <title>Ladybird Found</title> <link href="http://localhost/myPetBlog/Item1"/> <updated>2008-01-30T09:30:00Z</updated> <summary>Want to read about how we found LadyBird </summary> </entry> </feed>
The Atom Publishing Protocol is a query language very similar to the Structured Query Language (SQL) that s designed for exclusive use with the Atom Syndication Format The Atom Publishing Protocol consists of four primary commands: GET, POST, PUT, and DELETE The GET command is analogous to the SQL select statement, the POST command is analogous to the SQL insert statement, the PUT command is analogous to the SQL update statement, and the DELETE command is analogous to the SQL delete statement
Conclusion
Silverlight executes in an isolated environment on the client s machine As such, postbacks to the server do not automatically occur; rather, calls are made to a service residing on a web server to retrieve server resources Silverlight supports only asynchronous networking calls Silverlight supports several networking protocols, including POX, SOAP, JSON, REST, RSS, and Atom
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Who Goes There Securing Silverlight Applications
Microsoft Silverlight 3: A Beginner s Guide
Key Concepts & Skills
Learn the basic concepts of software security Understand the importance of properly managing and protecting user credentials Explore how users are authenticated in SOA scenarios Illustrate how to use the classes in the Silverlight SystemSecurity namespace to protect data through cryptography
raditionally, web applications have been considered difficult to secure Silverlight applications are rich interactive applications (RIAs), an application type that runs locally on a client machine but utilizes the Web as a transport and communication mechanism Hence, Silverlight applications are faced with all the security challenges of a standard web application However, whereas most commonly used web development frameworks, such as ASPNET, include intrinsic server-side security features, Silverlight applications include only minimal security features that execute on the client Silverlight applications communicate with a server through a server-side Web Service or WCF service Web Services do not include security features as advanced as full web development frameworks The following sections describe common solutions for securing Silverlight applications
Software Security Basics
It has been said that in today s economy, data is money and this is true Data is vital to businesses today Data is at the heart of all business software Additionally, data pertaining to a user s identification is a foundational component of ecommerce In ecommerce and business today, a business must be able to trust data related to a user and the user s identity As such, identity theft is growing to be one of the top crimes perpetrated With that said the need to protect data managed by software is of prime importance and should be considered in the conceptual and logical software design phases In fact, a formal
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