System.Web.Mobile
The System.Web.Mobile namespace provides various classes to support mobile Web application development with ASP.NET. The following MSDN link lists and describes these classes.
http://msdn.microsoft.com/en-us/library/system.web.mobile.aspx
System.Web.UI.MobileControls
The System.Web.UI.MobileControls namespace provides a set of controls that can be used in applications targeting mobile devices. The following MSDN link explores these controls.
http://msdn.microsoft.com/en-us/library/system.web.ui.mobilecontrols.aspx
System.Web.UI.MobileControls.Adapters
The System.Web.UI.MobileControls.Adapters namespace provides a set of classes to override the stages in the life-cycle of a mobile control and modify its default HTML, WML or other markup or behavior. The following MSDN link explores these classes.
http://msdn.microsoft.com/en-us/library/system.web.ui.mobilecontrols.adapters.aspx