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First, note the B using statement for the System.Web.Script.Services namespace. This namespace is part of the core ASP.NET AJAX framework that encapsulates some of the network communication and scripting functionality. It s not required, but it s included to save you a little extra typing. Next are the new attributes adorned on the C class and D method declarations of the web service. These attributes are parsed by the ASP.NET AJAX framework and used to determine what portions of the service are exposed in the JavaScript proxies. The ScriptMethod attribute isn t required, but you can use it to manipulate some of a method s settings. If you view the ASMX file in your browser but append /js to the end of the URL, you get a glimpse of the JavaScript proxy that is generated for this service. Figure 1.14 shows the generated JavaScript proxy that is produced by the framework after decorating the class and methods in the web service. In chapter 5, we ll spend more time explaining what the proxy generates. In the meantime, if you glance at the proxy, you ll notice at the end the matching call to the service method GetEmployeeCount. This gives the client-side script a mechanism for calling the web methods in the service. The call takes a few extra parameters that you didn t define in the service. With a web service ready to go, you can create a new page for this solution. Start by adding a new web form to the site, called EmployeeLookupClient.aspx. The first requirement in adding Ajax support to the page is to include the ScriptManager control. This time, you ll also declare a service reference to the local web

A key feature of CouchDB is that it is a document-oriented database management system Basically, this means that the data stored in a CouchDB database comprises a series of documents, each of which can contain a series of fields and values Each document is independent of one another, and there is no strict schema that they must adhere to Traditional databases that adhered to the relational model stored data in a series of tables; they were made up of rows and columns of data In a relational database, you must predefine the schema that all data in each table will adhere to, and all the data contained in the table must strictly conform to that schema If you are used to SQL-based databases like Oracle, SQL Server, and MySQL, you are probably quite familiar with the concepts of relationships, primary keys, foreign keys, referential integrity, and so forth.

Figure 3-13. Use iPod Safari s interactive bookmarks navigation to locate and open your favorite bookmarks.

Behaviors let you encapsulate a portion of client logic and plug it into a DOM element. Multiple behaviors can be associated with a single element, so a DOM element can acquire, at the same time, the client functionality provided by your behavior and, say, a third-party behavior. The client functionality of the element is the sum of the client capabilities provided by each behavior. In the next section, we ll experiment with controls, the other category of visual components. We ll follow an approach similar to that used for behaviors. You ll start by creating a simple control, and then we ll explain how to create instances of controls and how to access them in the application code. Finally, you ll see how to create custom controls. This will give you full control over ASP.NET AJAX client components.

If you are not, don t panic, because these concepts don t exist in CouchDB In fact, it may take some time for a SQL developer to grasp the idea of a database without relationships and a row/column layout Instead of a primary key field, each document in a CouchDB database has a unique ID This unique ID can be assigned by the user or application, or it can use a universally unique identifier (UUID) a random number generated by CouchDB that greatly reduces the chance of duplicate IDs being used All data relevant to the document in question is stored directly in that document itself The fact that CouchDB is a schema-free database management system is very important When developing a relational database, you must carefully think about how your database should be modeled before you create it.

Identifying bookmarks is easy. Folders look like folders, and each bookmark is marked with a small, open book symbol. Tap one of these, and Safari takes you directly to the associated page.