C#: IComparable: Converting miles to kilometers

gistfile1.cs

using System;
using System.Collections;

/*
 * Sample Output
 * 
 * 10 miles (16.09344 km)
 * 86 miles (138.403584 km)
 * 146 miles (234.964224 km)
 * 214 miles (344.399616 km)
 * 279 miles (449.006976 km)
 * 326 miles (524.646144 km)
 * 326 miles (524.646144 km)
 * 355 miles (571.31712 km)
 * 459 miles (738.688896 km)
 * 482 miles (775.703808 km)
 */
namespace IComparableExample {
    class Program {
        static void Main(string[] args) {

            ArrayList distances = new ArrayList();
            Random rnd = new Random();

            // Generate 10 random distances
            for ( int ctr = 1 ; ctr <= 10 ; ctr++ ) {
                int miles = rnd.Next( 1, 500 );
                Distance dist = new Distance();
                dist.Miles = miles;
                distances.Add( dist );
            }
            
            // Sort the ArrayList (which calls on CompareTo)
            distances.Sort();

            // Displays the sorted distances
            foreach ( Distance dist in distances )
                Console.WriteLine( dist.Miles + " miles (" + dist.Kilometers + " km)" );

            // Allow user to read output
            Console.Read();
        }
    }

    public class Distance : IComparable {
        protected double distanceMiles;

        // Compares the current instance with another object of the same type
        // and returns an integer that indicates whether the current instance
        // precedes, follows, or occurs in the same position in the sort order
        // as the other object.
        public int CompareTo(object obj) {
            Distance otherDistance = obj as Distance;
            if ( otherDistance != null )
                return this.distanceMiles.CompareTo( otherDistance.distanceMiles );
            else
                throw new ArgumentException( "Object is not a Distance" );
        }

        public double Miles {
            get {
                return this.distanceMiles;
            }
            set {
                this.distanceMiles = value;
            }
        }

        public double Kilometers {
            get {
                return this.distanceMiles * 1.609344;
            }
            set {
                this.distanceMiles = value / 1.609344;
            }
        }
    }
}