Class

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

namespace Notifier
{
    public class Person : INotifyPropertyChanged
    {
        private string _name;
        private string _lastName;
        private string _address;
 
        public string Name
        {
            get { return this._name; }
            set
            {
                this._name = value;
                NotifyPropertyChanged("Name");
            }
        }

        public string LastName
        {
            get { return this._lastName; }
            set
            {
                this._lastName = value;
                NotifyPropertyChanged("LastName");
            }
        }

        public string Address
        {
            get { return this._address; }
            set
            {
                this._address = value;
                NotifyPropertyChanged("Address");
            }
        }
        public event PropertyChangedEventHandler PropertyChanged;

        private void NotifyPropertyChanged(string info)
        {
            if (PropertyChanged != null)
            {
                PropertyChanged(this, new PropertyChangedEventArgs(info));
            }
        }
    }

}

Main

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

namespace Notifier
{
    class Program
    {
        static void Main(string[] args)
        {
            Person sergio = new Person();
            sergio.PropertyChanged += new PropertyChangedEventHandler(sergio_PropertyChanged);

            sergio.Name = "Sergio";
            Console.ReadLine();

            sergio.Name = "Serg";
            Console.ReadLine();
        }

        static void sergio_PropertyChanged(object sender, PropertyChangedEventArgs e)
        {
            Console.WriteLine("Something changed!");
            Console.WriteLine(e.PropertyName);
        }
    }
}