This sample is a quick demo of combining Windows Azure Mobile Services OFFLINE/SYNC with Xamarin.Forms PCL. It also uses Xaml for the layout of the screens.

Check out these links for more info on Azure offline support:

• Get started with Offline Data in Mobile Services

• Donna Malayeri: Using Xamarin.iOS preview of Mobile Services offline

• Michael Ridland: Tips for Offline in Azure Mobile Services on Xamarin.iOS

• Carlos Figueira: Deep dive on the offline support in the Azure Mobile Service managed client SDK

Finally, here is a great link/essay on the issues with offline data & synchronization:

• Dealing with Disconnected Operation in a Mobile Business Application: Issues and Techniques for Supporting Offline Usage

Based on TodoAzure but with the new pre-release Sync Nuget.

Many Xamarin code samples are based on the simple Tasky sample, which has been converted to Xamarin.Forms here.

There is also a Xaml version and an Mvvm version