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As always, you need to think about a few things before starting to code. Always keep in mind that when designing a new feature, you must analyze that feature from the final user s perspective. For the visual part, you ll use a text box in which the visitor can enter one or more words to search for. In BalloonShop, the words entered by the visitor will be searched for in the products names and descriptions. The text entered by the visitor can be searched for in several ways: Exact-match search: If the visitor enters an entire phrase, this phrase is searched in the database as it is, without splitting the words and searching for them separately. All-words search: The phrase entered by the visitor is split into words, causing a search for products that contain every word entered by the visitor. This is like the exact-match search in that it still searches for all the entered words, but this time the order of the words is no longer important. Any-words search: Products must contain at least one of the entered words. This simple classification isn t by any means complete. The search engine can be as complex as the one offered by modern search engines, which provides many options and features and shows a ranked list of results, or as simple as searching the database for the exact string provided by the visitor.

This chapter explored some more ideas for developing your web services. You took an in-depth look at web service security and considered when (and if) it makes sense to use session state and transactions in a web service. To keep learning about web services, it helps to look at examples on the Web, such as TerraService. For even more experimentation, consider some of the following web services: XMethods (http://www.xmethods.com) is a more general web service catalog. It includes many web services you can use in .NET applications, such as a currency exchange reporter and a delayed stock quote. Even though most of these web services run on non-.NET platforms, you can use them in your .NET applications seamlessly. Microsoft MapPoint (http://msdn.microsoft.com/library/en-us/dnanchor/html/ anch_mappointmain.asp) is an interesting example that enables you to access highquality maps and geographical information. MapPoint isn t free, but you can use a free trial of the web service.

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AVG(column) COUNT(DISTINCT column) COUNT(*) MAX(column) MIN(column) SUM(column)

omponent-based programming is a simple, elegant idea. When used properly, it allows your code to be more organized, consistent, and reusable. It s also incredibly easy to implement in a .NET application, because you never need to use the Windows registry or perform any special configuration. A component, at its simplest, is one or more classes that are compiled into a separate DLL assembly file. These classes provide some unit of logically related functionality. You can access a component in a single application, or you can share the component between multiple applications. Your web pages (or any other .NET application) can use the classes in your components in the same way they use any other .NET class. Best of all, your component is encapsulated, which means it provides exactly the features your code requires and hides all the other messy details. When combined with careful organization, component-based programming is the basis of good ASP.NET application design. In this chapter, you ll examine how you can create components (and why you should) and consider examples that show you how to encapsulate database functionality with a well-written business object. You ll also learn how to bind your database component to the web controls on a page using the ObjectDataSource.

BalloonShop will support the any-words and all-words search modes. This decision leads to the visual design of the search feature (see Figure 5-1).

To master ASP.NET development, you need to become a skilled user of the .NET class library. So far, you ve learned how to use .NET components designed for reading files, communicating with databases, calling web services, and storing information about the user. Though these class library ingredients are powerful, they aren t customizable, which is both an advantage and a weakness. For example, if you want to retrieve data from a SQL Server database, you need to weave database details (such as SQL queries) directly into your code-behind class or (if you re using the SqlDataSource) into the .aspx markup portion of your web page file.

Returns the average value of the specified column Counts the number of distinct values in the specified column Gives the number of rows in the specified table Returns the maximum value in the specified column Returns the minimum value in the specified column Returns the total of all the values in the specified column

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