Assembly: System.Windows (in System.Windows.dll)
Data written to the IsolatedStorageSettings object is saved when the application that uses the class is closed. If you want your application to write to isolated storage immediately, you can call the method in application code.
Windows PhoneOn Windows Phone, IsolatedStorageSettings is not thread safe and throws an InvalidOperationException when the method is called. However you don’t have to call the method on Windows Phone. The data that you store in the IsolatedStorageSettings object is saved automatically.
If the IsolatedStorageFile does not have enough available free space to save your application settings, an IsolatedStorageException will be thrown. If more space is required, use the IsolatedStorageFile.IncreaseQuotaTo method to request more storage space from the host.