ASP.NET PDF Viewer using C#, VB/NET

intervals to ensure that the information is up-to-date. The stock tracker retrieves its data from a Web Service whose WSDL is located at www.swanandmokashi.com/HomePage/WebServices/ StockQuotes.asmx WSDL. The news window is a simple window that displays the current top news stories supplied by Yahoo!. Instead of using a Web service, Yahoo! provides the news as an RSS feed. RSS is a simple XML-based format for distributing newslike items. RSS is simpler to work with than Web services. Like the weather forecast and stock ticker windows, the news window automatically refreshes itself periodically to provide the latest headline news. Clicking an item in the news window opens the article in a separate browser window. The last window on the Ajax Dashboard is a Yahoo! search component. This component is similar to the Yahoo! search example from 4. The big difference is that in this application, the search results display in a drop-down list box under the text box, which is updated as the user is typing the search time. This is really a combination of the Yahoo! search and autocomplete examples from 4. Clicking an item in the drop-down list opens the resource in a new browser window. Together these four components make up the Ajax Dashboard example. The components are all good candidates for Ajax techniques because they represent data that can change rapidly, and the ability to seamlessly update the data in one window without needing to refresh the entire page is a big plus.

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type Implementation = class val mutable state : int new() = {state = 0} interface MyInterface with member x.ChangeState y = x.state <- y end end let imp = new Implementation() let inter = imp :> MyInterface let pintIntNewline i = print_int i print_newline() let main() = inter.ChangeState 1 pintIntNewline imp.state inter.ChangeState 2 pintIntNewline imp.state inter.ChangeState 3 pintIntNewline imp.state main() The results are as follows: 1 2 3 Note near the end of the example you must cast the identifier imp to the interface MyInterface before you can use the method ChangeState: let imp = new Implementation() let inter = imp :> MyInterface This is because interfaces are explicitly implemented in F#. If you want the methods of the interface to be available directly on the class that implements it, instead of after casting the object to the interface, you can add the interface members to the definition of the class. To revise the example, you simply add ChangeState as a member of the class Implementation. Now it is no longer necessary to cast the identifier imp. I cover adding members to methods in the section Classes and Methods later in the chapter. #light type MyInterface = interface abstract ChangeState : int -> unit end

Also introduced in 2009, the NXT Temperature Sensor (PN #9749) is intended for the education market and is not supported by the consumer version of the NXT. The sensor can read from 4 F to 248 F ( 20 C to 110 C), which is a much wider range than the original RCX Temperature Sensor we will cover later. Figure 1-20 shows the sensor with its long metal probe. It has an integral cable because the standard connector could be damaged during an experiment.

type Implementation = class val mutable state : int new() = {state = 0} interface MyInterface with member x.ChangeState y = x.state <- y member x.ChangeState y = x.state <- y end let imp = new Implementation() let pintIntNewline i = print_int i print_newline() let main() = imp.ChangeState 1 pintIntNewline imp.state imp.ChangeState 2 pintIntNewline imp.state main() The results are as follows: 1 2

The Ajax Dashboard includes a few nice touches that set it apart from a traditional browserbased application Each of the four components is rendered in an absolutely positioned div tag, and with the help of the DOM-Drag library, you can drag each component with the mouse to any position on the screen The DOM-Drag library, available at wwwyoungpupnet/2001/domdrag, is described by its author as a lightweight, easy-to-use, dragging API for modern DHTML browsers (see Figure 8-8) The setup requires only a couple of lines of JavaScript for each component, minimizing the hassle of using DOM-Drag The single JavaScript file is only 121 lines long and roughly 8KB in size The colored title bar of each Ajax Dashboard component is the handle for dragging the component.

The Robotics Invention System included two Touch Sensors and one Light Sensor. There was also a Temperature Sensor that could be ordered separately. The Rotation Sensor had to be ordered separately, too, and this was a serious drawback because Rotation Sensors are critical to building complex projects. It also consumed one of the three RCX input ports, unlike the NXT built-in Rotation Sensor. All the RCX sensors require the conversion cable (LEGO #8528) to connect them to the NXT.