using System;

namespace ConsoleApp3
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine(GenerateNonceNum(5));
            Console.Read();
        }

        /// <summary>
        /// 生成隨機數字
        /// </summary>
        /// <param name="length">字符串長度</param>
        /// <returns></returns>
        public static string GenerateNonceNum(int length)
        {
            char[] chars = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', };
            string result = "";
            Random rnd = new Random(Guid.NewGuid().GetHashCode());
            for (int i = 0; i < length; i++)
            {
                result += chars[rnd.Next(chars.Length)];
            }
            return result;
        }
    }
}