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These charts are useful in determining where a stock is going, its recent trends, and its long-time trends. Many stocks move between high values and low values in what sometimes looks like a sine wave; this is typically called its trading envelope. This is apparent in Figure 10-11, which shows a cycle from 26 to 28 indicating that March 2007 had been a good point to purchase the stock on a short-term basis because it is at the lower end of the trading envelope. This is no guarantee that the stock will not break from the trading envelope and fall far below 26. Also, typically when a stock breaks from its trading envelope, it tends to move quickly outside the trading range, which can lead to the stock rocketing either upward or downward. A more reliable methodology for using price history analysis is to use the Bollinger band method, which you ll see a bit later. But, let s get back to the technology how is this implemented The resource and data retrieval tiers are the same as for the text-based price history pane you saw previously. If you ve skipped ahead, you should return to the Creating the Price History Pane section, which describes the DataTier web service and how you can use it to retrieve the price history of a stock. To implement the charts, the example uses the ZedGraph open source library.

the WS-Federation specification, which allows you to set up and manage trusted communications across application and domain boundaries. This is not the same thing as the WS-Secure Conversation specification, which we discuss in 7. However, there are shared concepts between the two specifications.

NOTE Do not confuse the message protocol with the transport protocol. SOAP is a message protocol that provides a specification for constructing messages. HTTP TCP and SMTP are transport protocols, which are different specifica, , tions for transporting messages. SOAP messages may be delivered using all of these transport protocols.

ZedGraph (http://zedgraph.org) is an open source set of classes, written in C#, that enable the creation of various 2D graphs of arbitrary datasets. Because the set is class-based, it has a high degree of programmatic flexibility, and you can modify almost every aspect of a graph, including features such as scale ranges, scale types, step sizes, and so on, to be overridden from their defaults. It also allows for multirange, multitype, multiaxis graphs to be overlaid in a single chart. See Figure 10-13 for an example of a single chart that includes stacked bars, transparent overlays, filled lines, legends, and annotations.

Addressing information can be sensitive, especially when it contains port numbers and references to qualified endpoints. We are used to thinking of this information as being public because Web services are often publicly accessible. But with WSAddressing, this information is attached to the SOAP message header directly. You typically do not want the body of the SOAP message to be tampered with or viewed by unauthorized parties. In the same way, you should feel equally protective about the SOAP message headers. Another sensitive case is when messages are routed between multiple endpoints, each of which writes additional WS-Addressing information to the message header. The additional endpoints may not be designed to handle direct service requests from outside clients. Their addressing information needs to be kept protected. There are three recommended options for securing the contents of a message that contains addressing headers: 1. 2. 3. Digitally sign the message, including the body and header information. Encrypt the message headers. Add a message ID.

One of our first thoughts when we heard about WCF was whether WCF Web services would be different compared to ASP .NET Web services. And if so, how would they differ The good news is that while WCF Web services are different, they still retain the core characteristics of a traditional ASP .NET Web service, but with even more functionality and flexibility. WCF Web services support the standard WSDL and SOAP specifications, in addition to the extended WS- specifications.

As such, ZedGraph makes an excellent choice for use in an ASP.NET AJAX-based project and is easy to implement in your applications. You simply make a reference to the ZedGraph.DLL in your solution and add the ZedGraph tools to your Toolbox in the standard way.

Digital signing allows you to detect whether a message has been tampered with or compromised. Digital signing alone will not encrypt or hide the contents of the message, but it will ensure that a tampered message will be automatically rejected by the receiving Web service. Encrypting the message headers will clearly protect its contents, but this approach works best if the message is not being routed or referred to another Web service endpoint. Intermediary Web services will need access to the addressing header information, so there is an additional burden on the developer to ensure that the intermediaries can encrypt the message header contents. The message ID (<wsa:MessageID>) is important because it allows you to design against replay attacks, whereby a client repeatedly resends the same message to a Web service endpoint in order to overwhelm the service and to bring down its host server. The receiving Web service simply needs to cache this message ID, and then ignore additional requests that come in.

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