Defining Class to collect a List<OnotherClass>

Problem 3.Paths

using _01Point3D;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Path
{
    class PathMain
    {
        static void Main(string[] args)
        {
            Point3D point1 = new Point3D(1, 4, 1);
            Point3D point2 = new Point3D(-4, 10, 2);
            Point3D point3 = new Point3D(4, 1, 2);
            Point3D point4 = new Point3D();

            List<Point3D> list = new List<Point3D>() { point1, point2, point3 };
            Path3D path1 = new Path3D(list);
            Path3D path2 = new Path3D(new List<Point3D>() { point4, point1 });
            Console.WriteLine(path1);
            Console.WriteLine(path2);

        }
    }

    class Path3D
    {
        public List<Point3D> pointsInPath { get; set; }

        //ctor
        public Path3D(List<Point3D> points)
        {
            this.pointsInPath = points;
        }

        public override string ToString()
        {
            StringBuilder sb = new StringBuilder();
            foreach (var item in pointsInPath)
            {
                sb.Append(item + " |");
            }
            return sb.ToString();
        }
    }
}