private static void AddTestData(EFCContext context)
        {
            var clients = new[]
            {
                new CLIENT {
                    CLIENT_ID = "CL99", CLIENT_NAME = "Client 99"
                },
                //new CLIENT {CLIENT_ID ="CL80", CLIENT_NAME ="Client 80"}
            };

            var clientContacts = new[]
            {
                new CLIENT_CONTACT {
                    CLIENT_ID = "CL99", CONTACT_ID = 1, CONTACT_NAME = "Contact 1", CONTACT_EMAIL = "*****@*****.**"
                },
                new CLIENT_CONTACT {
                    CLIENT_ID = "CL99", CONTACT_ID = 2, CONTACT_NAME = "Contact 2", CONTACT_EMAIL = "*****@*****.**"
                },
                new CLIENT_CONTACT {
                    CLIENT_ID = "CL99", CONTACT_ID = 3, CONTACT_NAME = "Contact 3", CONTACT_EMAIL = "*****@*****.**"
                },
                new CLIENT_CONTACT {
                    CLIENT_ID = "CL99", CONTACT_ID = 4, CONTACT_NAME = "Contact 4", CONTACT_EMAIL = "*****@*****.**"
                },
            };

            var orders = new[]
            {
                new ORDER {
                    ORDER_ID = 1, CLIENT_ID = "CL99", CREATION_DATE = DateTime.Now.Subtract(TimeSpan.FromDays(10))
                },
                new ORDER {
                    ORDER_ID = 2, CLIENT_ID = "CL99", CREATION_DATE = DateTime.Now.Subtract(TimeSpan.FromDays(5))
                },
                new ORDER {
                    ORDER_ID = 3, CLIENT_ID = "CL99", CREATION_DATE = DateTime.Now.Subtract(TimeSpan.FromDays(2))
                },
                new ORDER {
                    ORDER_ID = 4, CLIENT_ID = "CL99", CREATION_DATE = DateTime.Now
                },
            };

            var orderDetails = new[]
            {
                new ORDER_DETAIL {
                    ORDER_ID = 1, CLIENT_ID = null, BILLING_TYPE = "B0"
                },                                                                         //no contact information
                new ORDER_DETAIL {
                    ORDER_ID = 2, CLIENT_ID = "CL99", BILLING_CONTACT_ID = 1, SHIPPING_CONTACT_ID = 2, BILLING_TYPE = "B0"
                },                                                                                                                         // Both contacts set
                new ORDER_DETAIL {
                    ORDER_ID = 3, CLIENT_ID = "CL99", SHIPPING_CONTACT_ID = 3, BILLING_TYPE = "B1"
                },                                                                                                 //only Shipping contact
                new ORDER_DETAIL {
                    ORDER_ID = 4, CLIENT_ID = "CL99", BILLING_CONTACT_ID = 4, BILLING_TYPE = "B3"
                },                                                                                                //only billing contact
            };

            try
            {
                context.AddRange(clients);
                context.AddRange(clientContacts);
                context.AddRange(orders);
                context.AddRange(orderDetails);
                var result = context.SaveChanges();

                Console.WriteLine($"Test data added to {context.Database.ProviderName}, result => {result}");
            }
            catch (Exception ex)
            {
                Console.WriteLine($"Failed {nameof(AddTestData)} {ex}");
            }
        }