c# code to generate barcode FIGURE .3-2 . The ASP page in Listing 3-2 appears like this in Internet Explorer . in Visual C#

Print Denso QR Bar Code in Visual C# FIGURE .3-2 . The ASP page in Listing 3-2 appears like this in Internet Explorer .

FIGURE .3-2 . The ASP page in Listing 3-2 appears like this in Internet Explorer .
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When you select an item from the selection control, notice that the page responds by telling you what you selected . This demonstrates ASP support for dynamic content .
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Part I Fundamentals
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Notice that even though classic ASP offers a way to decide your page s content at run time, you still have to create much of the content using raw HTML . Also, the state of the controls is always reset between posts . (I discuss this topic later in the examination of the ASP .NET ViewState .) ASP .NET adds a layer of indirection between the raw HTML and the rendered page that layer of indirection is provided by the collection of ASP .NET server-side controls . Server-side controls eliminate much of the tedium necessary to develop a Web-based UI in classic ASP .
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Packaging .the .UI .as .Components
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Being able to assemble the UI from component parts is one of the most-cited benefits of producing components . The earliest methods for building components in the Windows operating system were to write custom Windows procedures, to use the owner draw capabilities of controls such as list boxes or buttons, and to subclass an existing window . In the early 1990s, Windows employed Microsoft Visual Basic Controls (VBXs) as a viable UI technology . Of course, that was more than a decade ago . Throughout the mid- and late 1990s and early 2000s, ActiveX controls represented the graphical user interface (GUI) componentization technology of the day . Windows Forms controls are the current standard for modular GUIs for writing rich client applications . In the late 1990s, ActiveX controls also emerged as a way to render a Web-based GUI as components . The idea was that by using an ActiveX control in a page, the control would be downloaded as users surfed to the page . During the mid-1990s, Java applets also gained some popularity as a way to package GUI components for distribution over the Web . However, both of these techniques depend on some fairly extensive infrastructure on the client computer (the Component Object Model infrastructure to support ActiveX and a Java Virtual Machine to support Java applets) . When you re developing a Web site, you might not be able to count on a specific infrastructure being available on the client computer to support your GUI . To support the greatest number of clients, represent your GUI using only HTML . That means GUI componentization must happen on the server side . Now that modern client platforms are becoming more homogeneous, Web UIs are beginning to lean increasingly toward the Asynchronous Java and XML programming model (AJAX) . You see how AJAX works a bit later in this book . AJAX tends to push more intelligence back up to the browser . However, AJAX applications still have plenty of rendering to do . The ASP .NET UI componentization model makes developing AJAX applications very approachable . The AJAX programming model includes a lot of underlying plumbing code that fits perfectly in the server-side control architecture of ASP .NET . As you saw earlier, ASP .NET introduces an entirely new model for managing Web pages . The infrastructure of ASP .NET includes a well-defined pipeline through which a request flows . When a request ends up at the server, ASP .NET instantiates a handler (an implementation
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3 The Page Rendering Model
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of IHttpHandler) to deal with the request . As you see in 19, HTTP Handlers, the handling architecture is extraordinarily flexible . You can write any code you wish to handle the request . The System.Web.UI.Page class implements IHttpHandler by introducing an object-oriented approach to rendering . That is, every element you see on a Web page emitted by an ASP .NET page is somehow generated by a server-side control . Let s see how this works .
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Read UPC Symbol In C#.NET
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Bar Code Encoder In VS .NET
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