It's true: you can build native apps for iOS, Android, and Windows Phone with C# and the .NET Framework--with help from MonoTouch and Mono for Android. This hands-on guide shows you how to reuse one codebase across all three platforms by combining the business logic layer of your C# app with separate, fully native UIs. It's an ideal marriage of platform-specific development and the "write once, run everywhere" philosophy. By building a series of simple applications, you'll experience the advantages of using .NET in mobile development and learn how to write complete apps that access the unique features of today's three.