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We have used both a String and DateTime to create a Person class. Please note how the age is calculated.

Code for the Person Class:.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Employees
{
    class Person
    {
        private String Name;
        private DateTime Birthday;
        public Person()
        {
            Name = "unknown";
            Birthday = System.DateTime.Now;
        }
        public Person(String name, DateTime birthday)
        {
            Name = name;
            Birthday = birthday;
        }
        public Person(String name, int year, int month, int day)
        {
            Name = name;
            Birthday = new DateTime(year,month,day);
        }
        public void SetName(String s)
        {
            if (s != "") Name = s;
        }
        public void SetBirthday(DateTime bday)
        {
            Birthday = bday;
        }
        public void SetBirthday(int year, int month, int day)
        {
            Birthday = new DateTime(year,month,day);
        }

        public String getName()
        {
            return Name;
        }

        public DateTime getBirthday()
        {
            return Birthday;
        }
        public int Age()
        {
            // Get todays date.
            DateTime today= System.DateTime.Now;
            // Get birthday this year.
            DateTime birthdayThisYear = new DateTime(today.Year, Birthday.Month, Birthday.Day);
            // Calculate how old they will be this year;
            int age= today.Year - Birthday.Year;
            // If there birthday is after today, they aren't that age yet:
            if (birthdayThisYear.Date > today.Date) age--;
            return age;
        }
    }
}

Code in form load to create an instance of the Person class:

private void Form1_Load(object sender, EventArgs e)
{
   // Create a new person
   // Try a date that is prior to today and one that is after today.
   Person person = new Person("Mark", 1998, 5, 21);
   // Display the name and age:
   Text = person.getName() + " is " + person.Age() + " years old.";
}

End of lesson, Next lesson: Zebra Notes: Open, Save, Save As, and Format with a Rich Text Box