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The point of this appendix was to provide an introduction to the cross-platform nature of the C# programming language and the .NET platform when using the Mono framework. You have seen how Mono ships with a number of command-line tools that allow you to build a wide variety of .NET assemblies, including strongly named assemblies deployed to the GAC, Windows Forms applications, and .NET code libraries. You ve also learned that Mono is not fully compatible with the .NET 3.5 or .NET 4.0 programming APIs (WPF, WCF, WF, or LINQ) or the C# 2010 language features. Efforts are underway (through the Olive project) to bring these aspects of the Microsoft .NET platform to Mono. In any case, if you need to build .NET applications that can execute under a variety of operating systems, the Mono project is a wonderful choice for doing so.

For example, say you expect the user to enter a subject for his or her message, and the user enters a string interspersed by escaped line feed (%0A) and space (%20) characters: Have a nice day%0ABcc:spamtarget@example.com%0A%0AL0w%20c0st%20mortgage! The result would be as follows: Subject: Have a nice day Bcc: spamtarget@example.com L0w c0st mortgage! ... For that reason, Drupal s built-in mail function drupal_mail() in includes/mail.inc runs all headers through mime_header_encode() to sanitize headers. Any nonprintable characters will be encoded into ASCII printable characters according to RFC 2047, and thus neutralized. This involves prefixing the character with = UTF-8 B and then printing the Base64-encoded character plus =. You re encouraged to use drupal_mail(); if you choose not to, you ll have to make the mime_header_encode() calls yourself.

This chapter concludes your investigation of the WPF programming model by introducing you to the process of building customized controls. This chapter begins by examining two topics that are important when creating a custom control: dependency properties and routed events. Once you understand these topics, you will learn about the role of a default template, as well as how to view them programmatically at runtime. Once this foundation has been laid, the remainder of this chapter will examine how to build custom UserControl classes using Visual Studio 2010 and Expression Blend, including the .NET 4.0 Visual State Manager (VSM).

Part 7 is devoted to an examination of constructing web applications using the ASP.NET programming API. Microsoft designed ASP.NET to model the creation of desktop user interfaces by layering an eventdriven, object-oriented framework on top of a standard HTTP request/response.

Now, we need to provide a form so that the administrator can choose how many beeps are desired We do this by defining one or more fields using Drupal s form API We ll also write functions for form validation and submission The names of the functions are based on the action s ID as defined in hook_action_info() The action ID of the action we are currently discussing is beep_multiple_ beep_action, so convention dictates that we add _form to the form definition function name to get beep_multiple_beep_action_form Drupal expects a validation function named from the action ID plus _validate (beep_multiple_beep_action_validate) and a submit function named from the action ID plus _submit (beep_multiple_beep_action_submit).

This chapter begins your study of web application development using ASP.NET. As you will see, serverside scripting code has now been replaced with real object-oriented languages (e.g., C# and VB .NET). This chapter will examine the construction of an ASP.NET web page, the underlying programming model, and other key aspects of ASP.NET, such as your choice of web server and the use of Web.config files.

Whereas the previous chapter showed you how to construct ASP.NET Page objects, this chapter will examine the controls that populate the internal control tree. Here, you will examine the core ASP.NET web controls, including validation controls, the intrinsic site navigation controls, and various databinding operations. This chapter will also illustrate the role of master pages and the ASP.NET theme engine, which is a server-side alternative to traditional style sheets.

Summary

This chapter extends your understanding of ASP.NET by examining various ways to handle state management under .NET. Like classic ASP, ASP.NET allows you to create cookies and application-level and session-level variables quite easily. However, ASP.NET also introduces a new state management technique: the application cache. Once you look at the numerous ways to handle state with ASP.NET, you will examine the role of the HttpApplication base class and learn how to alter the runtime behavior of your web application dynamically using the Web.config file.