Overriden == operator

example.cs

class Program
{
    static void Main(string[] args)
    {
        var person1 = new Person("Jonas", "Lomholdt");
        var personN = new Person("Jonas", "Lomholdt");
        var person2 = new Person("Mike", "Tyson");
        Person person3 = null;

        // Show that comparing instances is working

        var expected = true;
        var actual = Person1 == PersonN; // true

        var expected = false;
        var actual = Person1 == Person2; // False

        var expected = true;
        var actual = Person1 != Person2; // true

        var expected = true;
        var actual = Person3 is null; // true

        var expected = true;
        var actual = Person3 == null; // true

        // Here comes the fun part

        var expected = false;
        var actual = Person1 == null; // true
        // What?! This should be false. Person1 is instantiated

        // Using the is operator however works just fine every time.
        var expected = false;
        var actual = Person1 is null; // false
    }
}