ASP.NET Web Sites for Mobile Devices 4.0 , visual studio 2010

Developing ASP.NET pages for mobile device browsers does not differ substantially from developing pages for desktop browsers. To help you create applications for mobile devices, ASP.NET provides a System.Web.Mobile namespace devoted specifically to mobile Web development.

You can create a Web page from the MobilePage base class and add controls from the System.Web.Mobile namespace. This namespace defines a suite of Web server controls and adapters that are especially useful when creating applications that need to be available to many different mobile devices, such as cell phones.

ASP.NET also provides a control-adaptive architecture that allows custom device adapters to be created for ASP.NET Web server controls. The adapters can create custom rendering for a control based on the requesting browser. With the adaptive architecture, you can create custom adapters for ASP.NET Web server controls to render output specific to the devices that access your application on desktop browsers.

Whether developing for desktop browsers or mobile devices, development follows the standard .NET event-driven model in which your application responds to user requests, button clicks, and so on.

http://msdn.microsoft.com/en-us/library/ms178619.aspx#MobileApplicationArchitecture