Does ASP.NET accept PHP as main coding language

You're confusing IIS (Internet Information Server) with ASP.NET - the server-side ecosystem from Microsoft. IIS is equivalent to the the Apache web server. It can host many different web frameworks. ASP.NET is a specific, Microsoft-developed framework that uses C# or Visual Basic and provides the underlying framework for generating web pages in those languages. Yes, you can use PHP with IIS; no, you can't use PHP with ASP.NET without some sort of adapter that allows you to call methods on .NET objects.

If the only reason to make use of ASP.NET is to use AJAX, then you're in luck. You can use AJAX directly with PHP. AJAX is simply another way of making a web request, in this case an XMLHttpRequest instead of a full page request. But, a PHP web site will respond to this request as if it were just another web request, returning HTML or JSON (or XML if you really want) depending on how you implement the script.

Here are a few links on using AJAX with PHP (I have not vetted these, simply used Google). They may or may not use jQuery. For the client-side AJAX, the jQuery API docs should be sufficient (http://api.jquery.com).

• https://netbeans.org/kb/docs/php/ajax-quickstart.html
• http://www.developerdrive.com/2011/10/integrating-ajax-with-php-part-i/
• http://www.tutorialspoint.com/php/php_and_ajax.htm
• http://www.phptutorialforbeginners.com/2013/01/jquery-ajax-tutorial-and-example-of.html