public string VerificationCode(string mobile)
    {
      if (IsHandset(mobile))
      {
        string code = new Random().Next(111111, 999999).ToString();
        string content = "親，本次操作的驗證碼為:" + code + " 切勿泄漏此驗證碼信息給他人，如非本人操作，請忽略此條信息?！咎平桶汀?;
        bool ret = SendFast(mobile, content);
        if (ret)
        {
          return code;
        }
        else
        {
          return "發(fā)送失敗";
        }
      }
      else
      {
        return "手機(jī)號碼格式不正確";
      }
    }
    /// <summary>
    /// 驗證手機(jī)號碼是否合法
    /// </summary>
    /// <param name="str_handset"></param>
    /// <returns></returns>
    public bool IsHandset(string str_handset)
    {
      return System.Text.RegularExpressions.Regex.IsMatch(str_handset, @"^1[3|4|5|7|8][0-9]\d{8}$");
    }

 <?xml version="1.0" encoding="utf-8" ?><returnsms>
 <returnstatus>Success</returnstatus>
 <message>ok</message>
 <remainpoint>62095</remainpoint>
 <taskID>2779227</taskID>
 <successCounts>1</successCounts></returnsms>