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In this chapter, you learned that patterns are like recipes for developers. Patterns require the inclusion of key elements to behave as expected. We focused on two key patterns: the singleton and factory. The singleton pattern allows you to define a central point of responsibility. The singleton class holds an instance of itself in a static variable and vends it by a getInstance() static method. This method returns a reference to that variable, as well as performing the initial instantiation if it has not previously been done. This delayed instantiation is called lazy loading. A singleton class should also mark its constructor with a private modifier to prevent direct instantiation. To close a loophole that could create a copy of the singleton, the __clone() magic method must also be defined and marked private. The factory pattern allows you to create a class that is designed to instantiate and return instances of other classes depending on differences in input or application configuration. The factory pattern contains one method, factory(), which, by definition, must return an object. You saw a couple examples of where the factory pattern can be useful specifically, in fileformat abstraction and database portability.

Figure 14-14. Navigating through the menu Overall, the Menu and TreeView controls expose strikingly similar programming models, even though they render themselves quite differently. They also have a similar style-based formatting model. But a few noteworthy differences exist: The Menu displays a single submenu. The TreeView can expand an arbitrary number of node branches at a time. The Menu displays a root level of links in the page. All other items are displayed using fly-out menus that appear over any other content on the page. The TreeView shows all its items inline in the page. The Menu supports templates. The TreeView does not. (Menu templates are discussed later in this section.) The TreeView supports check boxes for any node. The Menu does not. The Menu supports horizontal and vertical layouts, depending on the Orientation property. The TreeView supports only vertical layout.

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The Delete and Update commands return a single piece of information: the number of affected records. You can examine this value and use it to determine whether the operation is successful or executed as expected. The rest of this chapter shows how you can combine SQL with the ADO.NET objects to retrieve and manipulate data in your web applications.

The Menu control provides an overwhelming number of styles. Like the TreeView, the Menu adds a custom style class, which is named MenuItemStyle. This style adds spacing properties such as ItemSpacing, HorizontalPadding, and VerticalPadding. However, you can t set menu item images through the style, because it doesn t have an ImageUrl property. Much like the TreeView, the Menu supports defining different menu styles for different menu levels. However, the key distinction that the Menu control encourages you to adopt is between static items (the root-level items that are displayed in the page when it s first generated) and dynamic items (the items in fly-out menus that are added when the user moves the mouse over a portion of the menu). Most websites have a definite difference in the styling of these two elements. To support this, the Menu class defines two parallel sets of styles, one that applies to static items and one that applies to dynamic items, as shown in Table 14-8.

ADONET relies on the functionality in a small set of core classes You can divide these classes into two groups: those that are used to contain and manage data (such as DataSet, DataTable, DataRow, and DataRelation) and those that are used to connect to a specific data source (such as Connection, Command, and DataReader) The data container classes are completely generic No matter what data source you use, once you extract the data, it s stored using the same data container: the specialized DataSet class Think of the DataSet as playing the same role as a collection or an array it s a package for data The difference is that the DataSet is customized for relational data, which means it understands concepts such as rows, columns, and table relationships natively The second group of classes exists in several different flavors.

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