Implement INotifyPropertyChanged in C#

INotifyPropertyChanged.cs

using System.ComponentModel;
using System.Runtime.CompilerServices;

var person = new Person {
    FirstName = "Hamid"
};
person.PropertyChanged += HandlePersonPropertyChanged;
person.FirstName = "Mohammad";
return;

void HandlePersonPropertyChanged(object sender, PropertyChangedEventArgs e) {
    Console.WriteLine($"Property '{e.PropertyName}' changed to '{((Person)sender).FirstName}'");
}

public class Person : INotifyPropertyChanged {
    public event PropertyChangedEventHandler? PropertyChanged;

    public string? FirstName {
        get => _firstName;
        set => SetField(ref _firstName, value);
    }

    private string? _firstName;

    private void OnPropertyChanged([CallerMemberName] string? propertyName = null) {
        PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
    }

    private bool SetField<T>(ref T field, T value, [CallerMemberName] string? propertyName = null) {
        if (EqualityComparer<T>.Default.Equals(field, value)) return false;
        field = value;
        OnPropertyChanged(propertyName);
        return true;
    }
}