Learn the essentials of Windows 10 Universal Windows Platform app development. Learn to design and develop a responsive user interface using tools that are optimized for Windows 10 app developers. This course is part one of a three-part programming series. Take your first step in using C# and XAML to develop Windows 10 Universal Windows Platform apps. In part one of this three-part programming series (three x 4-week courses) you develop a responsive UI that automatically adapts as the app window changes size.