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You can also do everything in html5, css and javascript.  When you need data, set up a web service in .NET (wcf).  You need to do that anyway.  

You can then load your html5 pages in a webview.  This will be the fastest to get you to speed.


The next step is to use something like phonegap http://phonegap.com/  that can convert your code for you.

The one complaint you hear about the first 2 methods is they can be a little laggy compared to a pure native app. However, the trade off is ease of making your app.   Often people start with these methods, then move to a pure native using Objective C or Java as stated by duncanb7.

Object-C for Apple
Jave for Android

http://mobiledevices.about.com/od/kindattentiondevelopers/tp/Android-Os-Vs-Apple-Ios-Which-Is-Better-For-Developers.htm
http://php.about.com/od/learnphp/a/Choosing-The-Right-Programming-Language-For-The-Job.htm

How other experts think ?