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It makes good sense to hide the rich error pages from ordinary users. However, the generic error pages really aren t that much more useful. The message they show has less information and won t reveal any secrets about your code (Figure 8-13), but it s still confusing for mere mortals. ASP.NET allows you to replace the generic error page with a custom error page of your own devising. The next section shows you how.

To create a class, you must define it using a special block structure: public class MyClass { // Class code goes here. } You can define as many classes as you need in the same file. However, good coding practices suggest that in most cases you use a single file for each class. Classes exist in many forms. They may represent an actual thing in the real world (as they do in most programming textbooks), they may represent some programming abstraction (such as a rectangle or color structure), or they may just be a convenient way to group related functionality (like with the Math class). Deciding what a class should represent and breaking down your code into a group of interrelated classes are part of the art of programming.

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In a deployed application, you should use the On or RemoteOnly error mode. Any errors in your application should be dealt with through error-handling code, which can then present a helpful and user-oriented message (rather than the developer-oriented code details in ASP.NET s rich error messages). However, you can t catch every possible error in an ASP.NET application. For example, a hardware failure could occur spontaneously in the middle of an ordinary code statement that could not normally cause an error. More commonly, the user might encounter an HTTP error by requesting a page that doesn t exist. ASP.NET allows you to handle these problems with custom error pages. You can implement custom error pages in two ways. You can create a single generic error page and configure ASP.NET to use it by modifying the web.config file as shown here: <configuration> <system.web> <customErrors mode="RemoteOnly" defaultRedirect="DefaultError.aspx" /> </system.web> </configuration> ASP.NET will now exhibit the following behavior: If ASP.NET encounters an HTTP error while serving the request, it will forward the user to the DefaultError.aspx web page. If ASP.NET encounters an unhandled application error and the mode is set to On (see Table 8-3), it will forward the user to the DefaultError.aspx. Remote users will never see the generic ASP.NET error page.

In the next example, you ll see how to construct a .NET class piece by piece. This class will represent a product from the catalog of an e-commerce company. The Product class will store product data, and it will include the built-in functionality needed to generate a block of HTML that displays the product on a web page. When this class is complete, you ll be able to put it to work with a sample ASP.NET test page.

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