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When you click the iTunes U tab, you can choose to sync specific, recent, or unplayed iTunes U content, or all content. TIP: iTunes U podcasts are similar to other audio or video podcasts, except that they focus on educational content and are mostly produced by colleges and universities. Most are free to subscribe to in the iTunes store. When you subscribe and set up the auto sync as shown in this section, you ll receive all your favorite iTunes U podcasts on your iPod touch. Be sure to check out the iTunes U section in the iTunes store. You may find your favorite college or university has shows to teach you biology or astronomy, or a whole lot more. There s even a Stanford University course on how to develop iPod touch apps! Many of the top universities broadcast class lectures from famous professors in iTunes U. Go ahead and check it out what you ll find is amazing! To sync iTunes U content from your computer to your iPod touch, follow these steps. 1. Connect your iPod touch to your computer, start iTunes, and click your iPod touch in the left nav bar. Click the iTunes U tab on the top of the main window. Check the Sync iTunes U box (see Figure 3 19). If you d like to sync recent or unplayed items, check the Automatically include box and use the pull-down to select All, 1 newest, All unplayed, 5 newest, 10 most recent unplayed, etc.

Figure 4-5. The swap_values method contains a reference pair to main s copy of p as well as a local integer variable to hold a temporary value.

The following code shows two method declarations. The first returns a value of type int. The second doesn t return a value. Return type int GetHour() { ... } void DisplayHour() { ... } No value is returned. A method that declares a return type must return a value from the method by using the following form of the return statement, which includes an expression after the keyword return. Every path through the method must end with a return statement of this form. return Expression; Evaluates to a value of the return type // Return a value.

The following sections tell you a little about the types of cases and price ranges you can choose from.

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Probably the simplest of the ASP .NET AJAX server controls is the Timer control. Similar in many ways to the Timer control that has existed for some time for Winforms, the Timer control provides a simple-to-use timer functionality that can be configured to perform operations repeatedly based on the time elapsed. Therefore, you can run certain operations at a regular interval in a synchronous or asynchronous manner without having to do a manual page refresh. This can come in handy in many scenarios for web applications.

The if and else keywords are used to define an if statement, which will perform a block of statements when a condition evaluates to the bool value true.

1. In theory, assemblies can consist of more than one of these byte streams. In this case, each byte stream is called a module and the assembly is called a multi-module assembly. However, this feature is used very seldom; therefore, I cover only single-module assemblies in this book.

On-demand loading is the mechanism to load objects as they are required by the application by making separate query requests to the data source for each object. The main objective for such a mechanism is to dedicate memory resources only when necessary by loading and instantiating an object only at the point when it is absolutely needed. This approach is advisable when you need to load the data for a few entities and the volume of the data is large. To facilitate loading on demand, the DataServiceContext class has a BeginLoadProperty method, which follows the same asynchronous model where you specify the source entity, the name of the property, and a callback, as shown in the BeginLoadProperty method signature here: public IAsyncResult BeginLoadProperty( Object entity, string propertyName, AsyncCallback callback, Object state ) So let s implement this approach in our example by adding the following line of code in the BookDataGrid_SelectionChanged method. //Explicit loading (Lazy loading) using BeginLoadPropety context.BeginLoadProperty(currentBook , "BookDetails", PropertyLoadCompleted, null); The callback method PropertyLoadCompleted is as follows: private void PropertyLoadCompleted(IAsyncResult result) { context.EndLoadProperty(result); //Getting reference to current selected book Book currentBook = BookDataGrid.SelectedItem as Book; if (currentBook == null) return; var query = (from bd in currentBook.BookDetails select bd); BookDetailsDataGrid.ItemsSource = query.ToList(); } So, as per the code snippet, once the EndLoadProperty is called, the property has been properly loaded with the related entity, so we can access the related entity BookDetail through the navigation property BookDetails to bind to our BookDetailsDataGrid control.

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