using System;

using System.Linq;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        List<Point3D> list = new List<Point3D>();

        for(int i = 0; i < 10; i ++)

        {

            list.Add(new Point3D(i, i + 1, i + 2));

        }

        Point3D p = list.OrderBy(x => x.X).FirstOrDefault();

        Console.WriteLine(p.X + " - " + p.Y + " - " + p.Z);

    }

}

​

public class Point3D

{

    public int X;

    public int Y;

    public int Z;

    public Point3D(int x, int y, int z)

    {

        X = x;

        Y = y;

        Z = z;

    }

}