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The web.config file uses a predefined XML format. The entire content of the file is nested in a root <configuration> element. Inside this element are several more subsections, some of which you ll never change, and others which are more important. Here s the basic skeletal structure of the web.config file, with the three most important sections highlighted in bold: < xml version="1.0" > <configuration> <configSections>...</configSections> <appSettings>...</appSettings> <connectionStrings>...</connectionStrings> <system.web>...</system.web> <system.codedom>...</system.codedom> <system.webServer>...</system.webServer> </configuration> Note that the web.config file is case-sensitive, like all XML documents, and starts every setting with a lowercase letter. This means you cannot write <AppSettings> instead of <appSettings>.

To sort rows of data by two or three columns, follow these steps: 1. Click a cell in one of the rows that you want to sort. 2. Click Data Sort. 3. In the Sort By and Then By lists, select the columns by which you want to sort. 4. Select any other sort options that you want. 5. Click OK. To sort rows of data by four columns, follow these steps: 1. Click a cell in one of the rows that you want to sort. 2. Click Data Sort. 3. In the first Sort By list, select the column of least sorting importance to you. 4. Click OK. 5. Click Data Sort again. 6. In the Sort By and Then By lists, select the other three columns by which you want to sort, starting with the column of most importance to you. 7. Select any other sort options that you want. 8. Click OK.

The beforeFilter() callback action is called before every action is executed. It is entered like any other action, as a PHP function, and interrupts processing controller logic in the requested action. To block users from accessing a certain area of the site, the beforeFilter() action can check the session for information. This particular callback example in Listing 7-2 ensures that for the View action, the user must be logged in; otherwise, it redirects the user to a login action (more on these possibilities later). This is just one example of using a callback to interrupt launching an action in the controller. Listing 7-2. The beforeFilter() Callback Aaction function beforeFilter() { if ($this->action == 'view') { if (!$this->Session->check('User')) { $this->redirect('/users/login'); } } }

As a web developer, there are three sections in the web.config file that you ll work with. The <appSettings> section allows you to add your own miscellaneous pieces of information. You ll learn how to use it in the next section. The <connectionStrings> section allows you to define the connection information for accessing a database. You ll learn about this section in 15. Finally, the <system.web> section holds every ASP.NET setting you ll need to configure. Inside the <system.web> element are separate elements for each aspect of website configuration. You can include as few or as many of these as you want. For example, if you need to specify special error settings, you would add the <customErrors> element in the <system.web> section. If you wanted to control how ASP.NET s security works, you d add the <authentication> and <authorization> sections. You ll consider the different elements that you can add to the <system.web> section throughout this book.