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why AsP.nET not support iPhone/iPad Programming?

Because it’s a proprietary Microsoft technology and XCode and Cocoa is Apple’s technology?

ASP.NET is controlled by Microsoft and they have no ability to program for Apple’s API’s which are owned by Apple. The iPhone/etc API’s are built on XCode and nothing else. That’s how programming works. API’s are not universal.
 
why AsP.nET not support iPhone/iPad Programming?

Well, First of all ASP.NET is a web technology. You can develop ASP.NET web apps and they work within the Safari browser. There are several companies out there with solutions for Mobile Phone theming. ComponentOne has a solution which provides a series of ASP.NET Controls which work on the iPhone. Also, http://www.jqtouch.com/ provides a very good framework for iPhone friendly User Interface elements.
 
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