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The third part of this book explores several topics that can help you transform ordinary web pages into polished web applications. In 9 you ll learn to use the validation controls to catch invalid data before the user submits it. In 10 you ll move on to consider some of ASP.NET s more exotic controls, such as the Calendar and Wizard. In 11, you ll learn how to build your own reusable blocks of web page user interface and draw custom graphics on the fly. Finally, 12 shows how you can standardize the appearance of an entire website with themes and master pages, and 13 shows you how to add navigation to a website.

The third part of this book explores several topics that can help you transform ordinary web pages into polished web applications. In 10 you ll learn to use the validation controls to catch invalid data before the user submits it. In 11 you ll move on to consider some of ASP.NET s more exotic controls, such as the Calendar and Wizard. In 12, you ll learn how to build your own reusable blocks of web page user interface and draw custom graphics on the fly. Finally, 13 shows how you can standardize the appearance of an entire website with themes and master pages, and 14 shows you how to add navigation to a website.

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Abstract classes involve the use of a common base class when you want to leave certain details up to its inheritors specifically, when you need to create a foundational object whose methods are not fully defined. You will find that by using abstraction, you can create very extensible architecture within your development projects. For example, file-format parsing lends itself particularly well to the abstract approach. In this case, you know that the object will need a set of methods, like getData() or getCreatedDate(), in order for it to interoperate with other classes; however, you want to leave the parsing methods up to inheriting classes that are designed for a specific file format. By using abstract classes, you can define that a parse() method must exist, without needing to specify how it should work. You can place this abstract requirement and the fully defined methods in a single class for easier implementation. You might think of abstract classes as partial classes because they do not define the implementation for all the methods they declare. Instead of implementing all methods, an abstract class has the added ability to define abstract methods, which are method prototypes lacking a body. These methods will be implemented when the class is derived. However, an abstract class doesn t need to consist solely of abstract methods; you re free to declare fully defined methods as well.

Almost all software needs to work with data, and web applications are no exception. In 14, you begin exploring the world of data by considering ADO.NET Microsoft s .NET-powered technology for interacting with relational databases. s 15 and 16 explain how to use data binding and the advanced ASP.NET data controls to create web pages that integrate attractive, customizable data displays with automatic support for paging, sorting, and editing.

Almost all software needs to work with data, and web applications are no exception. In 15, you begin exploring the world of data by considering ADO.NET Microsoft s .NET-powered technology for interacting with relational databases. s 16 and 17 explain how to use data binding and the advanced ASP.NET data controls to create web pages that integrate attractive, customizable data displays with automatic support for paging, sorting, and editing.

17 moves out of the database world and considers how to interact with files. 18 broadens the picture even further and describes how ASP.NET applications can use the XML support that s built into the .NET Framework.

18 moves out of the database world and considers how to interact with files. 19 broadens the picture even further and describes how ASP.NET applications can use the XML support that s built into the .NET Framework.

Every public website needs to deal with security making sure that sensitive data cannot be accessed by the wrong users. In 19, you ll start out learning how ASP.NET provides different authentication systems for dealing with users. You can write your own custom logic to verify user names and passwords, or you can use existing Windows account information. In 20, you ll learn about the membership model, which extends the authentication system with prebuilt security controls and handy objects that automate common tasks. If you want, you can even get ASP.NET to create and manage a database with user information automatically. Finally, 21 deals with another add-on the profiles model that lets you store information for each user automatically, without writing any database code.

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