C# 'Base' keyword Simple Example

using System;

namespace ConsoleApplication1
{
    class Person
    {
        private string _firstName;
        protected string _lastName;
        public Person(string firstName, string lastName)
        {
            this._firstName = firstName;
            this._lastName = lastName;
        }

        public string GetName()
        {
            return string.Format("Name: {0}, Last-Name: {1}", this._firstName, this._lastName);
        }
    }

    class Employee : Person
    {
        private int _stuffNum;
        public Employee(string firstName, string lastName, int stuffNum)
            : base(firstName, lastName)
        {
            _stuffNum = stuffNum;
        }

        public string GetEmployeeInfo()
        {
            Console.WriteLine("this: " + this._lastName);
            Console.WriteLine("Base: " + base._lastName);
            return base.GetName() + ", " + this._stuffNum;
        }
    }

    class Program
    {
        static void Main()
        {
            var p1 = new Person("Ivandro", "Ismael");
            var e1 = new Employee("John", "Paul", 10);
            Console.WriteLine(p1.GetName());
            Console.WriteLine(e1.GetEmployeeInfo());
            Console.ReadLine();
        }
    }
}