Instantiate.cs

private static void Instantiate(PersistenceProviderConfigSection configSection){
  if (Providers == null)
    SetupProvider(configSection);
}

private static void SetupProvider(PersistenceProviderConfigSection config){
  if (config == null)
    throw new Exception("PersistenceProvider are not configured to be used with this application");

  Providers = new PersistenceProviderCollection();
  ProvidersHelper.InstantiateProviders(config.Providers, Providers, typeof(PersistenceProviderBase));
  DefaultProvider = Providers[config.DefaultProvider] as PersistenceProviderBase;
}