public static ProviderConfigurationException MultipleDefaultProviders(EnProviderType providerType)
 {
     return new ProviderConfigurationException(EnConfigurationReason.MultipleDefaultProviders, string.Format("{0}: 2 or more default providers specified, but only 1 is allowed", providerType));
 }
 public static ProviderConfigurationException MissingDefaultProvider(EnProviderType providerType)
 {
     return new ProviderConfigurationException(EnConfigurationReason.MissingDefaultProvider, string.Format("{0}: No default provider specified", providerType));
 }