/// <summary>        /// 生成随机数字窜        /// </summary>        /// <param name="Digit">位数</param>        /// <returns></returns>        private string RandomNum(int Digit)        {            StringBuilder sb = new StringBuilder();            Random random = new Random();            int Nums = Digit;            while (Nums > 0)            {                int i = random.Next(1, 10);// 9>=a>=1                if (sb.Length < Digit)                {                    sb.Append(i);                }                Nums -= 1;            }            return sb.ToString();        }