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One of the most innovative features of $ expressions is that you can create your own expression builders that plug into this framework This is a specialized technique that, while neat, isn t always practical As you ll see, custom $ expressions make the most sense if you re developing a distinct feature that you want to incorporate into more than one web application For example, imagine you want a way to create a custom expression builder that allows you to insert random numbers You want to be able to write a tag such as this to show a random number between 1 and 6: <asp:Literal Runat="server" Text="<%$ RandomNumber:1,6 %>" /> Unfortunately, creating a custom expression builder isn t quite as easy as you probably expect The problem is how the code is compiled.

Summary

When you compile a page that contains an expression, the expression evaluating the code also needs to be compiled with it However, you don t want the expression to be evaluated at that point instead, you want the expression to be reevaluated each time the page is requested To make this possible, your expression builder needs to generate a generic segment of code that performs the appropriate task The technology that enables this is CodeDOM (Code Document Object Model) a model for dynamically generating code constructs Every expression builder includes a method named GetCodeExpression() that uses CodeDOM to generate the code needed for the expression In other words, if you want to create a RandomNumberExpressionBuilder, you need to create a GetCodeExpression() method that uses CodeDOM to generate a segment of code for calculating random numbers.

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The AddUserServlet class adds an element with its attributes to the user s XML document, then physically saves the file and prints out the updated XML on the screen:

This chapter examined how to make use of various ASP.NET web controls. We began by examining the role of the Control and WebControl base classes, and you learned how to dynamically interact with a panel s internal controls collection. Along the way, you were exposed to the new site navigation model (*.sitemap files and the SiteMapDataSource component), the new data binding engine (via the SqlDataSource component and the GridView control), and various validation -controls. The latter half of this chapter examined the role of master pages and themes. Recall that master pages can be used to define a common layout for a set of pages on your site. Also recall that the *.master file defines any number of content placeholders to which content pages plug in their custom UI content. Finally, as you were shown, the ASP.NET theme engine allows you to declaratively or programmatically apply a common UI look and feel to your widgets on the web server.

Clearly, it s not that straightforward and for anything but trivial code, it s quite lengthy All expression builders must derive from the base ExpressionBuilder class (which is found in the SystemWebCompilation namespace) Here s how you might declare an expression builder for random number generation:.

The previous two chapters concentrated on the composition and behavior of ASP.NET pages and the web controls they contain. This chapter builds on that information by examining the role of the Global.asax file and the underlying HttpApplication type. As you will see, the functionality of HttpApplication allows you to intercept numerous events that enable you to treat your web application as a cohesive unit, rather than a set of stand-alone *.aspx files driven by a master page. In addition to investigating the HttpApplication type, this chapter also addresses the all-important topic of state management. Here you will learn the role of view state, session and application variables (including the application cache), cookie data, and the ASP.NET Profile API.

In this example, the HTTP handler has an unrealistically easy job. After all, if you were simply interested in adding two numbers, your client-side code could accomplish the task without the Ajax request. This pattern becomes more important when the server-side code needs to do something the client can t, such as look up information in a server-side resource (a file or database), use sensitive information (such as secret numbers), or perform complex operations using classes that are available only in the .NET Framework.

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