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In many technologies, objects are always passed by reference. This means that when you pass an object from one machine or process to another, what actually happens is that the object remains in the original process, and the other process or machine merely gets a pointer, or reference, back to the object, as shown in Figure 1-19.

When writing code, inheritance allows one type to subclass another type. Often inheritance is abused, and used in contexts that aren t applicable. In those contexts, the best approach is to use composition.

While we re looking at the out-of-the-box functionality, let s take a quick little side trip into some additional administrative functionality: removing a workflow. It is important to note, however, that this functionality will be the same regardless of whether it is an out-of-the-box workflow or one of our custom workflows. From the Change Workflow Settings screen (shown earlier in Figure 3-2) for any list or document library, click the Remove a Workflow link. You will be taken to a screen similar to the one shown here:

If you don t need to retrieve default values from the database, you could have the collection object create the child object directly, using the new keyword. For consistency, however, it s better to stick with the factory method approach, so that all objects are created the same way.

long result = del.EndInvoke(iar); Console.WriteLine (" The result is: {0}.", result); } static void Main() { MyDel del = new MyDel(Sum); Console.WriteLine("Before BeginInvoke"); IAsyncResult iar = del.BeginInvoke(3, 5, new AsyncCallback(CallWhenDone), null); Console.WriteLine("Doing more work in Main."); Thread.Sleep(500); Console.WriteLine("Done with Main. Exiting."); } } This code produces the following output: Before BeginInvoke Doing more work in Main. Inside Sum Inside CallWhenDone. The result is: 8. Done with Main. Exiting.

After you play for a while with all these news sites, you ll begin to realize that there is no real standard for moving around. This means you ll need to become familiar with each app s own way of navigating articles, as well as how to return to the main screen. Here s a short guide for generally navigating these types of apps; these features are common to The New York Times, The Wall Street Journal, and USA Today apps: Showing or Hiding Control buttons or Captions: Tapping the screen once usually shows hidden controls or picture captions. You can tap them again to hide them again. Getting to the Details of an Article: Usually, you just scroll through the articles, just as you would on a web page. Viewing a Video: Tap a video to start playing it. Usually, this plays the video in the same manner as any other video. See 10: Viewing Videos, TV Shows, and More to learn how to navigate videos on the iPod touch.