TodoListViewModel
The TodoListViewModel constructor accepts an IDeviceProperties instance and an ITodoService instance, which, as you saw in Chapter 32, is used for storage and retrieval of to-do items. See the following excerpt:
public TodoListViewModel( ITodoService todoService, IDeviceProperties deviceProperties){... backupDatabaseCommand = new DelegateCommand(obj => BackupDatabase()); restoreDatabaseCommand = new DelegateCommand(obj => RestoreDatabase()); Load();}
The viewmodel contains a method that leverages the IDeviceProperties instance to create a unique ID to use to identify itself to calls to a WCF service.
string GetUserId(){ string id= deviceProperties.WindowsLiveAnonymousId; ...
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