public void DeleteAdminTest()
        {
            //// Arrange
            var errors = new List<string>();
            var mockRepository = new Mock<IAdminRepository>();
            var adminService = new AdminService(mockRepository.Object);

            //// Act
            adminService.DeleteAdmin(null, ref errors);

            //// Assert
            Assert.AreEqual(1, errors.Count);
        }
        public string DeleteStudent(string id)
        {
            var errors = new List<string>();
            var repository = new AdminRepository();
            var service = new AdminService(repository);
            service.DeleteAdmin(id, ref errors);

            if (errors.Count == 0)
            {
                return "ok";
            }

            return "error";
        }