Introduction

ASP.Net AJAX Extensions library consists of client-based Microsoft Library and server components that enables you to create web pages that include rich user experience and user friendly interface elements. ASP.Net AJAX extension library consists of client side script libraries based on ECMAScript i.e. Javascript and Dynamic-HTML (DHTML) that enable the developers to integrate it with ASP.Net web applications. ASP.Net AJAX applications offer:

• Improved efficiency
  
  
• Familiar UI controls
  
  
• Partial Page Postbacks
  
  
• Enables you to integrate client end functionality with ASP.Net server controls.
  
  
• Client scripts integration with ASP.Net services to apply authentication and user profiles.
  
  
• Supports almost all the modern browsers commonly used these days.

ASP.Net AJAX Extensions Architecture

ASP.Net AJAX consists of both client-script libraries as well as Server components to provide scalability to the ASP.Net web application.

Following are the Client-end Architecture components and libraries of ASP.Net AJAX extension libraries:

1. Components: Controls, Behaviors and non-visual components
   
   
2. Browser Compatibility: Provides the functionality to detect the browser and use appropriate XMLHttp ActiveX object that enables it to support almost all the modern browsers such as Internet Explorer, FireFox, and Safari etc.
   
   
3. Networking: XML and JSON requests, Asynchronous requests, Web and Application Services
   
   
4. Core Services: Serialization, Events and Javascript Class base extensions

Following are the Server Components of ASP.Net AJAX extension libraries:

1. Script Support: Localization, Globalization, debugging and tracing
   
   
2. Web Services: Proxy Generation, Page methods, XML and JSON serialization
   
   
3. Application Service: Forms Authentication and user profiles
   
   
4. Server Controls: Timer, Script Manager, Script Manager Proxy, Update Manager, Update Progress