.asp.net web App web with iPhone and Android web Browsers
I have project to create a UI for web App and UI must be tablet Friendly becasue of that I am wondering which one I should use web form 4.0 or MVC 3?and which one work with IOs and Android
Which framework matters a bit when you are worrying about the HTML output. I'd run with MVC3 in any case, but especially if I was working on a mobile app as you'll have much more precise control of the output.
I agree with everyone that MVC 3 is a great choice - in the end all that matters is the HTML that you are producing back to the browser. So to spice up the HTML that is being produced, have a look at Jquery UI Mobile (http://jquerymobile.com/) - looks really promising for developing cross platform mobile apps for all the major mobile platforms. I haven't used it my self yet, but have a feeling I will very soon.