static void useAccessModifiers()
{
var person = new PersonDate();
person.SetBirthdate(new DateTime(1982, 1, 1));
Console.WriteLine(person.GetBirthdate());
}
static void useProperties()
{
var person = new PersonDate(new DateTime(1982, 1, 1));
Console.WriteLine(person.Birthdate);
//use "person.Birthdate"
//to get birthdate variable using the {get; set;} in the property
Console.WriteLine(person.Age);
//person.Birthdate = new DateTime(1999, 2, 2);
//"person.Birthdate = ***"
//cannot be used because the "set" in {get; private set;}
///is set to private and can only be used in the constructor
}