/// <summary>
    /// 卡余额查询
    /// </summary>
    protected String CardBalanceQuery()
    {
        String cardNo   = Request["CardNo"];
        String cardPwd  = Request["CardPassword"];
        String cardType = Request["CardType"];

        long   balance;
        Int32  Result = ErrorDefinition.CIP_IError_Result_UnknowError_Code;
        String ErrMsg = ErrorDefinition.CIP_IError_Result_UnknowError_Msg;

        //查询余额
        Result = BesttoneAccountHelper.CardAuthen(cardNo, cardPwd, cardType, out balance, out ErrMsg);
        if (Result == 0)
        {
            return("[{\"result\":\"true\",\"balance\":\"" + BesttoneAccountHelper.ConvertAmountToYuan(balance) + "\"}]");
        }
        else
        {
            return("[{\"result\":\"false\",\"info\":\"查询余额失败\"}]");
        }
    }