C# 自动生成编号

/// <summary>
        /// 生成自增编号
        /// </summary>
        /// <param name="BaseNumber">原值</param>
        /// <returns></returns>
        public string NextNumber(string BaseNumber)
        {
            string NewNumber = "";//新值
            int InNumber = 1;//进位
            int PlaceValue;//位值
            char[] No = BaseNumber.ToCharArray();

            for (int i = BaseNumber.Length - 1; i >= 0; i--)
            {
                if (No[i] == '7' && InNumber == 1)
                {
                    InNumber = 1;
                    NewNumber = "0" + NewNumber;
                }
                else
                    if (InNumber == 1 && No[i] >= '0' && No[i] < '7')
                    {
                        PlaceValue = Int32.Parse(No[i].ToString());
                        PlaceValue = (InNumber + PlaceValue);
                        InNumber = 0;
                        NewNumber = PlaceValue.ToString() + NewNumber;
                    }
                    else
                    {
                        InNumber = 0;
                        NewNumber = No[i] + NewNumber;
                    }
            }
            if (BaseNumber == NewNumber)
                NewNumber = "G00000000";
            return NewNumber;
        }