生成注册码的一种算法(取余)

   public static string GetSN(string str)
        {
            string strResult="";//作为返回的字符串
            StringBuilder sbTemp=new StringBuilder();

            //生成注册码
            for (int i = 0; i < str.Length; i++)
            {
                int tIn = str[i] % 10;
                string tCh = tIn.ToString();
                sbTemp.Append(tCh);

            }
            strResult = sbTemp.ToString();

            return strResult;
        }