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    copied!<p>Here's an except from MVC RC1 release notes - Jan 2009</p> <p><strong>IsMvcAjaxRequest Renamed to IsAjaxRequest</strong></p> <blockquote> <p>The IsMvcAjaxRequest method been renamed to IsAjaxRequest. As part of this change, the IsAjaxRequest method was updated to recognize the X-Requested-With HTTP header. This is a well known header sent by the major JavaScript libraries such as Prototype.js, jQuery, and Dojo.</p> <p>The ASP.NET AJAX helpers were updated to send this header in requests. However, they continue to also send it in the body of the form post in order to work around the issue of firewalls that strip unknown headers.</p> </blockquote> <p>In other words - it was specifically renamed to be more 'compatible' with other libraries.</p> <p>In addition, for anyone who hasnt read the <a href="http://go.microsoft.com/fwlink/?LinkID=137661&amp;clcid=0x409" rel="nofollow noreferrer">full release notes</a> but has been using previous versions - even as recent as the beta - I <strong>STRONGLY</strong> recommend you read them in full. It will save you time in future and most likely excite you with some of the new features. Its quite surprising how much new stuff is in there.</p> <p><strong>Important note:</strong> You will need to make sure you upgrade the .js file for MicrosoftAjax.MVC (not the exact name) if upgrading to RC1 from the Beta - otherwise this method won't work. It isn't listed in the release notes as a required task for upgrading so don't forget to.</p>
 

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