Immutable domain entity

SquashPlayer.cs

public class SquashPlayer
{
    public readonly string Name;
    public readonly int Ranking;

    public SquashPlayer(string name, int ranking)
    {
        Name = name;
        Ranking = ranking;
    }

    public SquashPlayer WithRanking(int newRanking)
    {
        if (newRanking != Ranking) return new SquashPlayer(Name, newRanking);
        else return this;
    }
}