OperatorOverloading.cs

using System;

class Person
{
    public string FirstName;
    public string LastName;

    public static Person operator +(Person leftPerson, Person rightPerson)
    {
        return new Person
        {
            FirstName = rightPerson.FirstName,
            LastName = leftPerson.LastName
        };
    }

    public override string ToString()
    {
        return $"{FirstName} {LastName}";
    }
}

class Program
{
    static void Main(string[] args)
    {
        var dad = new Person
        {
            FirstName = "Joe",
            LastName = "Joesson"
        };
        var mom = new Person
        {
            FirstName = "Eve",
            LastName = "Evesson"
        };
        var child = dad + mom;

        Console.WriteLine($"{dad} and {mom} had a child named {child} together");
    }
}