public static ExternalCustomer CreateExternalCustomer(string externalCustomerID)
 {
     ExternalCustomer externalCustomer = new ExternalCustomer();
     externalCustomer.ExternalCustomerID = externalCustomerID;
     return externalCustomer;
 }
 public void AddToExternalCustomer(ExternalCustomer externalCustomer)
 {
     base.AddObject("ExternalCustomer", externalCustomer);
 }