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Introduction

In ASP.NET 1.x days, many client-side tasks, such as tracking mouse events, setting page focus, displaying/hiding a section of page, was not directly supported by asp.net. This is because ASP.NET applications are server-based; all web control events are handled on the server side. The constant round trips to and from server often slows down work processes, and the page-refreshing often ensured a web form would to lose its focus or its scroll position. Therefore programmers still rely on a multitude of JavaScript to keep web pages nimble and responsive. However, in ASP.NET 1.x, injecting JavaScript always involves two steps and quite some code: First, you weave your JavaScript function into a string in your code-behind page; second, you use the Page class of your web form to register the script, using either the Page.RegisterStartupScript or the Page.RegisterClientScriptBlock method.

ASP.NET 2.0 has inherited some of the ASP.NET 1.x approaches of including JavaScript in a web form. Moreover, it has added many methods and properties to smooth and simplify the handling of some of the most common client-side tasks. It has also introduced new ways to include JavaScript on the server side or load JavaScript from resources. In this article will go into detail of the enhancements and the various ways of working with Script code in ASP.NET 2.0.

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