Programming C#, Third Edition

Chapter 15. Programming Web Forms and Web Services

Rather than writing traditional Windows desktop and client-server applications, more and more developers are now writing web-based applications, even when their software is for desktop use. There are many obvious advantages. For one, you do not have to create as much of the user interface; you can let Internet Explorer and Netscape Navigator handle a lot of it for you. Another, perhaps bigger, advantage is that distribution of revisions is faster, easier, and less expensive. When I worked at an online network that predated the Web, we estimated our cost of distribution for each upgrade at $1 million per diskette (remember diskettes?). Web applications have virtually zero distribution cost. The third advantage of web applications is distributed processing. With a web-based application, it is far easier to provide server-side processing. The Web provides standardized protocols (e.g., HTTP, HTML, and XML) to facilitate building n-tier applications.

The .NET technology for building web applications (and dynamic web sites) is ASP.NET, which provides a rich collection of types for building web applications in its System.Web and System.Web.UI namespaces. There is a great deal to learn about ASP.NET, but much of it is language-independent. ASP.NET offers a rich suite of controls and related tools, including tools to validate data, display dates, present advertisements, interact with users, and so forth. Most of these require no coding ...