Extensible Application Markup Language (XAML is a simple and declarative language based on XML that uses the .xaml format for its files. In XAML, you can create, initialize, and set properties of objects with hierarchical relations. It is mainly used to design graphical user interfaces in Xamarin Forms, UWP (Universal Windows Platform), and WPF (Windows Presentation Foundation). In this article, you will learn how to convert Microsoft Project MPP files to XAML format using C#.