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That doesn't really make any sense. &nbsp;'xmlhttprequest' makes a request and the aspx page sends a response. &nbsp;There isn't any 'lifetime' associated with it.
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That doesn't really make any sense.  'xmlhttprequest' makes a request and the aspx page sends a response.  There isn't any 'lifetime' associated with it.

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Well, say you our using an AJAX control UpdatePanel on aspx page. You have controls within the UpdatePanel to be updated. You request an update on the UpdatePanel. It makes a XmlHttpRequest. &nbsp;<br />
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What stages of the page life cycle are executed? ( for example -Page_init, Load, Prerender, Render, unload.)
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Well, say you our using an AJAX control UpdatePanel on aspx page. You have controls within the UpdatePanel to be updated. You request an update on the UpdatePanel. It makes a XmlHttpRequest.  

What stages of the page life cycle are executed? ( for example -Page_init, Load, Prerender, Render, unload.)

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I think that depends on your code. &nbsp;You should click on &quot;Request Attention&quot; above and get the ASP.NET topic area added to your question.
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I think that depends on your code.  You should click on "Request Attention" above and get the ASP.NET topic area added to your question.

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What is the aspx page life cycle when performing an <b>xmlhttpreques</b>t?
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What is the aspx page life cycle when performing an xmlhttprequest?

xmlhttprequest

Asynchronous JavaScript and XML (AJAX) is a group of interrelated Web development techniques used on the client-side to create asynchronous Web applications. With AJAX, web applications can send data to and retrieve from a server asynchronously (in the background) without interfering with the display and behavior of the existing page. HTML and CSS can be used in combination to mark up and style information. The Document Object Model (DOM) is accessed with JavaScript to dynamically display and allow interaction with the information presented.

AJAX

The .NET Framework is not specific to any one programming language; rather, it includes a library of functions that allows developers to rapidly build applications. Several supported languages include C#, VB.NET, C++ or ASP.NET.

.NET Programming

The successor to Active Server Pages, ASP.NET websites utilize the .NET framework to produce dynamic, data and content-driven web applications and services. ASP.NET code can be written using any .NET supported language. As of 2009, ASP.NET can also apply the Model-View-Controller (MVC) pattern to web applications