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Figure 5-9. Encoding special HTML characters The HtmlEncode() method is particularly useful if you re retrieving values from a database and you aren t sure whether the text is valid HTML. You can use the HtmlDecode() method to revert the text to its normal form if you need to perform additional operations or comparisons with it in your code. Along with the HtmlEncode() and HtmlDecode() methods, the HttpServerUtility class also includes UrlEncode() and UrlDecode() methods. Much as HtmlEncode() allows you to convert text to valid HTML with no special characters, UrlEncode() allows you to convert text into a form that can be used in a URL. This technique is particularly useful if you want to pass information from one page to another by tacking it onto the end of the URL. You ll see this technique demonstrated in 7.

Summary

Excel can sort lists of data in ascending or descending alphabetical order or numerical order. For example, you can sort a list of sales transactions so that the most expensive sale appears first in the list.

In this chapter, you ve seen how ASP.NET controls fire events that you can handle in your code. Although server controls are the most common source of events, there s another type of event that you ll occasionally encounter: application events. Application events aren t nearly as

important in an ASP.NET application as the events fired by server controls, but you might use them to perform additional processing tasks. For example, using application events you can write logging code that runs every time a request is received, no matter what page is being requested. Basic ASP.NET features like session state and authentication use application events to plug into the ASP.NET processing pipeline. You can t handle application events in the code behind for a web form. Instead, you need the help of another ingredient: the Global.asax file.

The Global.asax file allows you to write code that responds to global application events. These events fire at various points during the lifetime of a web application, including when the application domain is first created (when the first request is received for a page in your website folder). To add a Global.asax file to an application in Visual Studio, choose Website Add New Item, and select the Global Application Class file type. Then, click OK. The Global.asax file looks similar to a normal .aspx file, except that it can t contain any HTML or ASP.NET tags. Instead, it contains event handlers. For example, the following Global.asax file reacts to the Application.EndRequest event, which happens just before the page is sent to the user: <%@ Application Language="VB" %> <script runat="server"> Sub Application_EndRequest(ByVal sender As Object, ByVal e As EventArgs) ' Code that runs at the end of every request. Response.Write("<hr>This page was served at " & DateTime.Now.ToString()) End Sub </script> This event handler uses the Write() method of the built-in Response object to write a footer at the bottom of the page with the date and time that the page was created (see Figure 5-10). Each ASP.NET application can have one Global.asax file. Once you place it in the appropriate website directory, ASP.NET recognizes it and uses it automatically. For example, if you add the Global.asax file shown previously to a web application, every web page in that application will include a footer.

As a framework, Cake inverts the flow of control and provides you, the developer, with an effective method for extending your web application in less time. Cake is built in PHP and therefore allows you to take advantage of a web-based framework without having to learn or use another programming language. Other benefits to using Cake include its MVC structure, which separates resources and functions of the application; the Bake script, which automates CRUD scripting; the scaffolding features, which reduce basic view rendering into one line of code; the built-in helpers, which reduce HTML output operations into single-line call-outs; and the large and still growing Cake community.

the best way to add a footer to the pages in your website. A better approach is to add a user control that creates the footer ( 12) or define a master page template that includes a footer ( 14).

Application.EndRequest is only one of more than a dozen events you can respond to in your code. To create a different event handler, you simply need to create a subroutine with the defined name. Table 5-11 lists some of the most common application events that you ll use.

Application_Start()