public void Initialize (string username, bool isAuthenticated)
{
_settingsContext = new SettingsContext ();
_settingsContext.Add ("UserName", username);
_settingsContext.Add ("IsAuthenticated", isAuthenticated);
SettingsProviderCollection spc = new SettingsProviderCollection();
spc.Add (ProfileManager.Provider);
base.Initialize (Context, ProfileBase.Properties, spc);
}