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Developers are writing more and more of their applications to run over the Web and to be seen in a browser. As we saw in 20, Silverlight lets you write C# code to run on the client side in the web browser. As for the server side of a web application, the .NET Framework offers ASP.NET. The focus of this chapter is to illustrate where ASP.NET and C# programming intersect when using Web Forms. ASP.NET is a huge topic, and for intensive coverage of ASP.NET, please see either Programming ASP.NET 3.5, Fourth Edition by Jesse Liberty, Dan Maharry, and Dan Hurwitz, or Learning ASP.NET 3.5, Second Edition by Jesse Liberty, Dan Hurwitz, and Brian MacDonald (both published by O Reilly).
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Web Forms Fundamentals
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Web Forms brings Rapid Application Development (RAD) to the creation of web applications. From within Visual Studio or Visual Web Developer, you drag-and-drop controls onto a form and write the supporting code in code-behind pages. The application is deployed to a web server (typically IIS, which is shipped with most versions of Windows, and Cassini, which is built into Visual Studio for testing your application), and users interact with the application through a standard browser.
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ASP.NET supports other models besides Web Forms. You can work directly at the HTTP level, for example. And .NET 4 introduces a new model called MVC (which stands for Model View Controller). MVC is more complex, but is ultimately more powerful and flexible, making it a good choice for more complex web applications. Since this is not an ASP.NET-specific book, we will look only at the simpler, RAD-based Web Forms model.
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Web Forms offers a programming model in which web pages are dynamically generated on a web server for delivery to a browser over the Internet. With Web Forms, you can create an ASPX page consisting of HTML and web controls, and you write C# code to
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respond to user actions and add additional dynamic content. The C# code runs on the server, and the data your code produces is integrated with the controls on your page to create an HTML page that is sent to the browser. You should pick up the following three critical points from the preceding paragraph and keep them in mind for this entire chapter: Web pages can have both HTML and web controls (described later). ASP.NET processing happens on the server in managed code. (You can, of course, use ASP.NET in conjunction with AJAX or Silverlight if you want client-side code.) ASP.NET controls produce standard HTML for the browser. A web form divides the user interface into two parts: the visual part or user interface (UI), and the logic that lies behind it. This is called code separation; and it is a good thing. The UI for an ASP.NET page is stored in a file with the extension .aspx. When you run the form, the server generates HTML that it sends to the client browser. This code uses the rich Web Forms types found in the System.Web and System.Web.UI namespaces of the .NET FCL. With Visual Studio, Web Forms programming couldn t be simpler: open a form, drag some controls onto it, and write the code to handle events. Presto! You ve written a web application. On the other hand, even with Visual Studio, writing a robust and complete web application can be a daunting task. Web forms offer a very rich UI; the number and complexity of web controls have greatly multiplied in recent years, and user expectations about the look and feel of web applications have risen accordingly. In addition, web applications are inherently distributed. Typically, the client will not be in the same building as the server. For most web applications, you must take network latency, bandwidth, and network server performance into account when creating the UI; a round trip from client to host might take a few seconds.
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To simplify this discussion, and to keep the focus on C#, we ll ignore client-side processing for the rest of this chapter, and focus on serverside ASP.NET controls.
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