C# ArrayList sortieren

    public override string ToString()
    {
        return x + "," + y;
    }

using System;
using System.Collections;

public class Zahl
{
    public int x;
    public int y;

    public Zahl(int x, int y)
    {
        this.x = x;
        this.y = y;
    }

    public override string ToString()
    {
        return x + "," + y;
    }
}


public class DieArrayListe
{

    public static void Main(string[] args)
    {
        ArrayList AL = new ArrayList();
        Random Rand = new Random();

        for (int i = 0; i < 10; i++)
        {
            Zahl z = new Zahl(Rand.Next(100), Rand.Next(100));
            AL.Add(z);
        }

        AL.Sort();
    }
}

public class Zahl : IComparable<Zahl>
{
    // ... bisheriger Inhalt

    public int CompareTo(Zahl that)
    {
        if(/* this kommt vor that */)
            return -1;
        if(/* this und that sind unvergleichbar */)
            return 0;
        
        return 1;
    }
}