C# 双色球选号

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Collections;

namespace ConsoleApplicationTest
{
    class Program
    {
        static void Main(string[] args)
        {
            Random random = new Random();
            for (int i = 0; i < 5; i++)
            {
                Console.WriteLine(getLastNum(random));
            }
           
            Console.ReadKey();
        }

        static string getFirstNum(Random random)
        {
            string results = "";
            int[] range = new int[33];
            for (int i = 0; i < 33; i++)//初始化范围集合，从1到33
            {
                range[i] = i + 1;
            }
            int[] result = CreateNumbers(random, range, 6);
            ArrayList al = new ArrayList();
            for (int i = 0; i < result.Length; i++)
            {
                al.Add(result[i]);
            }
            al.Sort();
            for (int i = 0; i < result.Length; i++)
            {
                if (Convert.ToInt32(al[i]) < 10)
                {
                    al[i] = "0" + al[i].ToString();
                }
            }
            results = al[0].ToString() + "," + al[1].ToString() + "," + al[2].ToString() + "," + al[3].ToString() + "," + al[4].ToString() + "," + al[5].ToString();
            return results;
        }

        static string getLastNum(Random random)
        {
            int num = random.Next(1, 12);
            string results = getFirstNum(random) + "+" + (num < 10 ? "0" + num.ToString() : num.ToString());
            return results;
        }

        //取出不重复的6个数
        static int[] CreateNumbers(Random random, int[] range, int count)
        {
            int[] result = new int[count];
            int index = 0;
            int temp = 0;
            for (int i = 0; i < count; i++)
            {
                index = random.Next() % (range.Length - i);
                result[i] = range[index];
                //将当前已使用过的数移至集合末尾，并且将末尾原来没有使用的数放到当前位置
                temp = range[range.Length - 1 - i];
                range[range.Length - 1 - i] = range[index];
                range[index] = temp;
            }
            return result;
        }

    }
}