Xamarin Certification Cheat Sheet 2026

The 30 highest-yield Xamarin Certification facts, distilled from real exam questions. Print it, save it as a PDF, or study it here — free, no sign-up.

1. Which interface must a ViewModel implement to support property change notifications in Xamarin.Forms MVVM? → INotifyPropertyChanged
2. What does the [IntentFilter] attribute do in Xamarin.Android? → Declares which intents an Activity or receiver responds to
3. Which Xamarin.Forms layout positions children using proportional or absolute coordinates? → AbsoluteLayout
4. In Xamarin cross-platform development, what is the Dependency Service used for? → Resolving platform-specific implementations from shared code
5. Which service type in Xamarin.Android runs in the foreground with a persistent notification? → Foreground Service
6. In Xamarin.Forms, which method on INavigation pushes a page onto the navigation stack asynchronously? → Navigation.PushAsync()
7. In Xamarin, what does the Repository pattern provide when working with data sources? → An abstraction over data access logic, separating business logic from data source details
8. In Xamarin.Android, what does the [Activity] attribute configure? → The Activity's AndroidManifest metadata such as Label and Theme
9. What is a XIB file in the context of Xamarin.iOS? → An Interface Builder file defining a single view or window
10. In Xamarin, what does the acronym 'PCL' stand for? → Portable Class Library
11. Which Xamarin.Forms CollectionView feature allows items to be selected by the user? → SelectionMode property set to Single or Multiple
12. What year did Microsoft complete the acquisition of Xamarin? → 2016
13. What does code signing accomplish in a Xamarin.iOS release build? → Cryptographically authenticates the app and enables distribution through the App Store
14. Which Xamarin.Forms class provides a cross-platform abstraction for accessing device sensors like GPS? → Xamarin.Essentials
15. What is a Custom Renderer used for in Xamarin.Forms? → Overriding the native platform control generated for a Xamarin.Forms element
16. In Xamarin.Android, which tool from the Android SDK helps identify over-drawn pixels and excessive layout nesting that degrades rendering performance? → GPU Overdraw visualization and Layout Inspector in Android Studio
17. Which Xamarin.Forms class enables you to define the visual structure of items in a ListView? → ItemTemplate using DataTemplate
18. Which Xamarin App Center feature provides continuous integration and automated builds? → App Center Build
19. Which Xamarin.Forms layout arranges children in a single row or column? → StackLayout
20. Which property on a Grid column or row definition sets a size proportional to remaining space? → Star (*) sizing
21. In Xamarin.Android, which Garbage Collector mode is recommended for apps with frequent short-lived allocations to minimize GC pause times? → SGen (Generational GC)
22. What is the purpose of the MessagingCenter in Xamarin.Forms? → To enable loosely coupled communication between components via a publish-subscribe pattern
23. Which Xamarin.iOS class is used to present a modal view controller? → PresentViewController
24. Which Xamarin.Essentials class provides cross-platform access to the device clipboard? → Clipboard
25. Which .NET project type replaced PCL as the preferred Xamarin shared library format? → .NET Standard Library
26. There are no APIs available in the Xamarin.Essentials library for → None of the above
27. In Xamarin SQLite-Net, which attribute marks a property as the primary key with auto-increment? → [PrimaryKey, AutoIncrement]
28. Which NuGet package provides SQLite database support commonly used in Xamarin apps? → sqlite-net-pcl
29. What does the Linker do in a Xamarin.iOS release build? → Removes unused code to reduce app size
30. In Xamarin.Forms, what does the FlexLayout's Wrap property control? → Whether child views can overflow onto additional lines