asp.net qr code Introducing Server Controls in ASP.NET AJAX in C#

Make QR Code in C# Introducing Server Controls in ASP.NET AJAX

CHAPTER
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Introducing Server Controls in ASP.NET AJAX
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he first three chapters of this book gave you an overview of ASP.NET AJAX and how you can use it to build web applications to restrict unnecessary full page postbacks and processing on your web pages, thus improving the performance and polish of your web applications. s 3 and 4 introduced you to the client-side controls presented by ASP.NET AJAX and stepped you through many examples of how to use these controls in JavaScript and in a new XML-based script called ASP.NET AJAX Library. You looked at some advanced aspects of the scripting framework, including actions, which are compound commands associated with an event or stimulus on a control; behaviors, which are automatic units of functionality that can be associated with a control, enabling things such as drag and drop; and data binding, which allows for controls to be wired up to each other or to themselves to pass data between them. In this chapter, you will go to the other side of the action the server and begin exploring the various server-side controls available to you when building your AJAX applications. You have seen one of these controls, the ScriptManager control, already. In this chapter, you will look at ScriptManager in more detail among other ASP.NET AJAX server controls. In 6 you will learn more about how these controls work by navigating through an application that actually uses these controls.
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Using ASP.NET AJAX Server Controls in Visual Studio 2005
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Visual Studio 2005 and ASP.NET offer some great design tools that allow you to visually construct pages, which fits in neatly with the concepts that ASP.NET AJAX introduces. Developers can place controls on a page, and these controls generate the JavaScript that is necessary to implement the AJAX functionality. In the following sections, you ll look at how to use these controls within the integrated development environment (IDE).
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CHAPTER 5 INTRODUCING SERVER CONTROLS IN ASP.NET AJAX
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In 3, you learned how to create a new AJAX-enabled ASP.NET site. Alternatively, you can just as easily create an AJAX-enabled ASP.NET web application if you have installed the Web Application Project add-on or Visual Studio 2005 SP1. Either way, upon creating the new project, you will notice the new added section to the Toolbox titled AJAX Extensions as shown in Figure 5-1.
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Figure 5-1. Your Toolbox tab containing AJAX server controls
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Now that you have the controls in your Toolbox, you can drag and drop them onto your web forms. The rest of this chapter discusses these controls and their object models, and in the next chapter, you ll start using these controls in hands-on examples. At the time of this writing, five server controls are included in the first release version of ASP.NET AJAX: Timer, ScriptManager, ScriptManagerProxy, UpdateProgress, and UpdatePanel. Currently, additional controls are packaged in the Futures CTP builds of ASP.NET AJAX, which should surface in future releases of ASP.NET AJAX. Using ASP.NET AJAX server controls is the easiest and quickest path to implementing AJAX functionality in your ASP.NET application. They are also ideal for when a minimal amount of change in desired for existing ASP.NET applications that make extensive use of ASP.NET server controls.
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Note If you plan on using Visual Studio 2005 AJAX-enabled web applications (following the web application model and not the ASP.NET web site model), be sure to install ASP.NET AJAX after installing Visual Studio 2005 SP1.
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CHAPTER 5 INTRODUCING SERVER CONTROLS IN ASP.NET AJAX
Introducing the ScriptManager Control
The ScriptManager control is pivotal at the very heart of ASP .NET AJAX. This control, as its name suggests, manages the deployment of the various JavaScript libraries that implement the client-side runtime functionality of ASP .NET AJAX. This control is also heavily used by other sever controls to provide partial page rendering and script file management.
Using the ScriptManager
You ve already used the ScriptManager control to create references on the client side with the ASP.NET AJAX Library. To add ScriptManager to your page, simply drag and drop it onto an ASP.NET page as shown in Figure 5-2.
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