I am building a Windows Phone 8.1 Silverlight App. I am able to use both the following registries:
Windows.Storage.ApplicationData.Current.LocalSettings;
IsolatedStorageSettings.ApplicationSettings;
The difference between Windows.Storage.ApplicationData.Current.LocalSettings
and IsolatedStorageSettings.ApplicationSettings
is that the first one is the newer unified Windows Store App API whereas the latter is from the "old" Silverlight API.
New is not always better but I personally think you should go with the modern version here. Both work with Silverlight but if you ever have to migrate your code to WinRT you will save yourself some time since the IsolatedStorageSettings
API does not work under WinRT.