When Microsoft created .NET, it wasn’t just dreaming about the future—it was also worrying about the headaches and limitations of the current generation of web development technologies. Before you get started with ASP.NET 2.0, it helps to take a step back and consider these problems. You’ll then understand the solution that .NET offers.

In this chapter you’ll consider the history of web development leading up to ASP.NET, take a whirlwind tour of the most significant features of .NET, and preview the core changes in ASP.NET 2.0. If you’re new to ASP.NET, this chapter will quickly get you up to speed. On the other hand, if you’re a seasoned .NET developer, you have two choices. Your first option is to read this chapter for a brisk review of where we are today. Alternatively, you can skip to the section “ASP.NET 2.0: The Story Continues” to preview what ASP.NET 2.0 has in store.
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The page request occurs before the page life cycle begins. When the page is requested by a user, ASP.NET determines whether the page needs to be parsed and compiled or whether a cached version of the page can be sent in response without running the page

In the start step, page properties such as Request and Response are set. At this stage, the page also determines whether the request is a postback or a new request and sets the IsPostBack property. Additionally, during the start step, the page’s UICulture property is set.
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This document outlines the key steps that are required to migrate an existing Microsoft ASP.NET AJAX application created with the RC release to work with the final (RTM) release. This document is intended to be a quick reference. For more details, download the whitepaper Changes between the ASP.NET AJAX (“Atlas”) CTP and the RC and RTM Release from the http://ajax.asp.net Web site. Note This document assumes that you have an application created with the RC release. If you are migrating an application from the CTP release, see the document “Converting Applications from ‘Atlas’ CTP to ASP.NET AJAX RTM” on the http://ajax.asp.net Web site.
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Microsoft’s .NET technology has attracted a great deal of press since Beta 1 was first released to the world. Since then, mailing lists, newsgroups, and web sites have sprung up containing a mixture of code samples, applications, and articles of various forms. Even if you’re not a programmer using existing ASP technology, it’s a good bet that you’ve at least heard of .NET, even if you aren’t quite sure what it involves. After all, there’s so much information about .NET, that it’s sometimes hard to filter out what you need from what’s available. With new languages, new designers, and new ways of programming,you might wonder exactly what you need to write ASP.NET applications.
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