1. AJAX enable your web applications
2. Provide a better user experience
3. Minimize server load and traffic
4. Return callback result to client
5. Process callback error on client
6. Display an HTML block while processing
7. Keep viewstate during AJAX requests
8. Initiate callbacks automatically
9. Server-side and client-side API
10. Support ASP.NET 1.1, 2.0, 3.5, 4.0
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