protected void Page_Load(object sender, EventArgs e) { /// The NHSNumbers to check string[] NHSNumbers = new string[] { "401023213", "4010232137" }; /// Loop over all NHSNumbers and check if they are valid foreach (string NHSNumber in NHSNumbers) { Debug.WriteLine("NHS Number Used: " + NHSNumber); var validateMe = new NHSNumberValidation(); validateMe.NHSNumberValdiation(NHSNumber); if (validateMe.getIsValid().Equals(true)) { Debug.WriteLine("This is a CORRECT NHS Number"); } else { Debug.WriteLine("This is NOT a NHS Number"); } } }