using System;

​

namespace LinkedList

{

    class Program

    {

        public class Customer

        {

            string FirstName;

            string LastName;

            DateTime DOB;

            public Customer Previous;

            public Customer Next;

            public void SetFirstName(string fName)

            {

                FirstName = fName;

            }

​

            public void SetLastName(string lName)

            {

                LastName = lName;

            }

            public void setDOB(DateTime DOBirth)

            {

                DOB = DOBirth;

            }

            public decimal CalcAge()

            {

                DateTime now = DateTime.Now;

                decimal age;

                String diff = (now - DOB).TotalDays.ToString();

​

                if (Decimal.TryParse(diff, out age))

                {

                    return decimal.Round(age / 365, 1);

                }

                else

                    throw new Exception("Age Error");

​

            }

            public void init(string fName, string lName, DateTime doBirth)

            {

                SetFirstName(fName);

                SetLastName(lName);

                setDOB(doBirth);

            }

​

            public void setNext(Customer cust)

            {

                Next = cust;

            }

            public void setPrevious(Customer cust)

            {

                Previous = cust;

            }

            public void PrintCustomer()

            {

                Console.WriteLine("{0} {1} , Age: {2}", FirstName, LastName, CalcAge());

            }

        }

        static void Main(string[] args)

        {

            Customer cust1 = new Customer();

            cust1.init("Alex", "Max",new DateTime(2000, 5, 1));

            Customer cust2 = new Customer();

            cust2.init("Martin", "X", new DateTime(1990, 10, 3));

            Customer cust3 = new Customer();

            cust3.init("Sali", "abc", new DateTime(1988, 12, 5));

            // set pointers

            cust1.setPrevious(null);

            cust1.setNext(cust2);

​

            cust2.setPrevious(cust1);

            cust2.setNext(cust3);

​

            cust3.setPrevious(cust2);

            cust3.setNext(null);

​

            Customer tmp = new Customer();          

            Console.WriteLine("Loop using Next");

            tmp = cust1;

            while (tmp != null)

            {

                tmp.PrintCustomer();

                tmp = tmp.Next;

            }

            Console.WriteLine("---------------");

​

            Console.WriteLine("Loop using Previous");

            tmp = cust3;

            while (tmp != null)

            {

                tmp.PrintCustomer();

                tmp = tmp.Previous;

            }

​

        }

    }

}

​