What is New in ASP.NET 2.0

Cross Page Posting - ASP.NET 2.0 allows you to post back from one page to another and you can obtain the source page values from the target page.

 Wizard Control - The wizard control allows you to easily add multi-step form entry scenarios to your pages.

Validation Groups - Validation groups allow multiple forms on a page to be separately validated.
Focus API - The Focus API enables you to set focus to any control on the page, specify default buttons to submit for input controls, and more.

Compilation Build Providers - ASP.NET 2.0 includes support for compiling declarative file formats when they are placed in the App_Code directory.

No Compile Pages - Pages in ASP.NET 2.0 can be excluded from the compilation process, to be interpreted at runtime instead.

Securing Non-ASP.NET content - Under IIS 6, you can easily secure non-ASP.NET files such as static images or classic ASP pages from within an ASP.NET application.

Client-Script Features - ASP.NET 2.0 includes several new features that take advantage of client-side script.