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If you re writing a Silverlight client, you ll find that WebClient offers only the asynchronous versions. And in general, that s true of all of Silverlight s networking support since Silverlight is designed just for building user interfaces, it doesn t even offer you the blocking forms.

and you might be able to discover editors, based on this idea that became collaborative filtering. He went off to MIT, and they started a company called Firefly that was based on his ideas. So anyway, this idea of doing a web-scale collaborative filtering, people who liked this web page liked these web pages, was what we did. We did the toolbar to do this and to offer information to people as they are moving around the Net. In return, all of these people would be giving us information as to where they went, what trails they took, which we d then learn from.

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If you could take only one tip away from this book, take this one: use good passwords! This is a mantra that we will use repeatedly throughout this book. We cannot overstate its importance. Your e-mail and online accounts are only as secure as the password you use to access them. And believe it or not, your e-mail account is valuable to a spammer. A resourceful spammer

As well as providing completion event notifications, WebClient also offers progress notifications through its DownloadProgressChanged event. This is raised from time to time during asynchronous downloads, regardless of which of the three methods you used. It provides two properties, BytesReceived and TotalBytesToReceive, which tell you how far the download has gotten and how far it has to go.

If you use these asynchronous methods in a GUI built with either WPF or Windows Forms, you don t need to worry about threading issues. As you ll see in later chapters, that is not true for all asynchronous APIs, but these automatically take care of UI threading for you as long as you start asynchronous operations from the UI thread, WebClient will raise completion and progress events on the UI thread.

Livingston: What did you learn Kahle: We learned what was related to other things. But in the great scale, what

WebClient offers the UploadString, UploadData, and UploadFile methods. These correspond directly to the DownloadString, DownloadData, and DownloadFile methods, but instead of fetching data with an HTTP GET, they send data to the server, typically using an HTTP POST, although overloads are available that let you specify other verbs, such as PUT.

Lots of APIs in the .NET Framework work with the Stream abstraction defined in the System.IO namespace. The XML classes can load data from a Stream, or write data into one, for example. The bitmap decoding and encoding classes in WPF can also work with streams. The first three lines of Example 13-12 obtain a stream for an Atom feed# from a WebClient and use it to initialize an XDocument. The code then uses LINQ to XML to extract the list of titles and links advertised by this particular feed.

I loved was watching some of these users though we didn t know who was who and we didn t care. In fact, that was very important because it s very private information. Something I think we re forgetting is that some of these other systems are collecting this information, and they do care who s who. Google s toolbar, for instance. Going and learning where people go, you learn a lot more than you want to know. So you have to go and delete some of them; otherwise, it gets scary.

can make hundreds of dollars by using your e-mail account to send spam. Since most web servers are fairly locked down password-wise (you d be surprised how many e-mail servers these days use weak passwords), the spammer needs your e-mail account s password to use it. And even if they do not access your messages, they might end up getting your e-mail account disabled by your provider because of the high level of garbage coming from your account. The reason the complexity of the password becomes such an issue is that no matter how heavily you encrypt the password and its transport over wire, if the password is far too easy to guess, then you may as well not have encrypted it in the first place. When we refer to complex passwords, we are typically referring to passwords that consist of eight or more characters, contain a special character, and contain both letters and numbers.

WebClient client = new WebClient(); Stream feedStm = client.OpenRead("http://feeds.feedburner.com/oreilly/news"); XDocument feedXml = XDocument.Load(feedStm); string ns = "http://www.w3.org/2005/Atom"; var entries = from entryElement in feedXml.Descendants(XName.Get("entry", ns))

#Atom is a common format for representing sets of items, such as blog entries or news articles. It s similar to RSS, but tries to avoid some of RSS s inconsistencies and limitations.

Livingston: Alexa deleted them Kahle: Yes. Alexa deleted things. Others that sort of followed in those footsteps

select new { Title = entryElement.Element(XName.Get("title", ns)).Value, Link = entryElement.Element(XName.Get("link", ns)). Attribute("href").Value }; foreach (var entry in entries) { Console.WriteLine("{0}: {1}", entry.Title, entry.Link); }

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