---
title: "Explain differences between the page execution lifecycle of an ASP.NET page and an ASP.NET AJAX page?"  
description: "Explain differences between the page execution lifecycle of an ASP.NET page and an ASP.NET AJAX page?"  
author: "Amit Singh"  
published: 2011-03-29  
updated: 2020-09-19  
canonical: https://www.mindstick.com/interview/710/explain-differences-between-the-page-execution-lifecycle-of-an-asp-dot-net-page-and-an-asp-dot-net-ajax-page  
category: "ajax"  
tags: ["ajax"]  
reading_time: 1 minute  

---

# Explain differences between the page execution lifecycle of an ASP.NET page and an ASP.NET AJAX page?

In an asynchronous model, all the server side events occur, as they do in a synchronous model. The Microsoft AJAX Library also raises client side events. However when the page is rendered, asynchronous postback renders only the contents of the update panel, where as in a synchronous postback, the entire page is recreated and sent back to the browser.

## Answers

### Answer by Amit Singh

In an asynchronous model, all the server side events occur, as they do in a synchronous model. The Microsoft AJAX Library also raises client side events. However when the page is rendered, asynchronous postback renders only the contents of the update panel, where as in a synchronous postback, the entire page is recreated and sent back to the browser.


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Original Source: https://www.mindstick.com/interview/710/explain-differences-between-the-page-execution-lifecycle-of-an-asp-dot-net-page-and-an-asp-dot-net-ajax-page

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