public void DeleteCustomersByAddress(string address)
        {
            using (RETAILContext context = new RETAILContext())
            {
                List <Customer> entities = context.Customers.AsQueryable().Where(c => c.Address == address).ToList();

                foreach (var entity in entities)
                {
                    context.Set <Customer>().Remove(entity);
                }

                context.SaveChanges();
            }
        }
        public void DeleteAllCustomers()
        {
            using (RETAILContext context = new RETAILContext())
            {
                List <Customer> entities = context.Customers.AsQueryable().ToList();

                foreach (var entity in entities)
                {
                    context.Set <Customer>().Remove(entity);
                }

                context.SaveChanges();

                //context.ExecuteStoreCommand("TRUNCATE TABLE [RETAIL].[STORE].[Customer]");
            }
        }