using System;

using System.Security.Cryptography;

public class Program

{

    public static void Main()

    {

        Child c1 = new Child(), c2 = new Child();

        Console.WriteLine("c1.ageInYears: {0}, c2.ageInYears: {1}", c1.ageInYears, c2.ageInYears);

        Console.WriteLine("c1.ageInYears: {0}, c2.ageInYears: {1}", c1.ageInYears, c2.ageInYears);

        Console.WriteLine("c1.ageInYears: {0}, c2.ageInYears: {1}", c1.ageInYears, c2.ageInYears);

    }

    public abstract class Parent

    {

        public abstract float ageInYears{get;}

    }

​

​

    public class Child : Parent

    {

        [ThreadStatic]

        private static Random _random;

        private float _ageInYears;

        public override float ageInYears { get { return _ageInYears; } }

        public Child()

        {

            if (_random == null)

            {

                var cryptoResult = new byte[4];

                new RNGCryptoServiceProvider().GetBytes(cryptoResult);

                int seed = BitConverter.ToInt32(cryptoResult, 0);

                _random = new Random(seed);

            }

            _ageInYears = (float)_random.NextDouble() * 10f;

        }

    }

}