public void EnterSpecialCharacterString()
        {
            //message = "0000";
            foreach (string input in IterateThroughTestData())
            {
                Exception ex = Assert.Throws <Exception>(() => CourseEnrollmentValidator.ValidateStudentId(input));

                Assert.Equal(message, ex.Message);
            }
        }
        public void EnterAnEmptyString(string input)
        {
            Exception ex = Assert.Throws <Exception>(() => CourseEnrollmentValidator.ValidateStudentId(input));

            Assert.Equal(message, ex.Message);
        }