public IEnumerable<Product> get_products_in(Department department)
 {
     return Enumerable.Range(1, 100).Select(x => new Product {});
 }
 public IEnumerable<Department> get_departments_in(Department department)
 {
     return Enumerable.Range(1, 100).Select(x => new Department { name = x.ToString("Sub Department 000") });
 }