internal class Program
{
    private static void Main(string[] args)
    {
        String Surname;  //Declaring a string variable named Surname
        int Age; //Declaring an int Variable called Age
        String NationalInsuranceNumber; //Declaring a string variable named NationalInsuranceNumber
        String UserDetails; //Declaring a string Variable named User Details

        Console.WriteLine("Please Enter Your Surname");

        Surname = Console.ReadLine();

        Console.WriteLine("Please Enter your Age");
        Age = int.Parse(Console.ReadLine());
        while (Age > 100)
        {


            if (Age < 100)
            {
                Console.WriteLine("This Age is Valid");

            }
            else
            {
                Console.WriteLine("Please Enter a Valid age ");
                break;
            }
            Console.ReadLine();
        }


        Console.WriteLine("Please Enter Your National Insurance Number");
        NationalInsuranceNumber = Console.ReadLine();
        if
            (NationalInsuranceNumber == null)
        {
            Console.WriteLine("Please Enter a Valid National Insurance Number");
        }
        else
        {
            Console.Write("This is a Valid National insurance Number");
        }



        Console.WriteLine("These Are Your details " + Surname + ", " + Age + ", " + NationalInsuranceNumber);
        UserDetails = Console.ReadLine();





        Console.WriteLine("Please press Enter to exit the program");
        Console.ReadKey();


    }
}