数据库查出来的数据可直接JSON格式化

 [WebMethod]    public string GetODR_BillDetail(string orderno)    {        string jsonResult = null;         DataTable dt = C_c.SelectT("select * from  ODR_OrderMain  where  OrderNo='" + orderno + "' or TrackingNo='" + orderno + "' or Field1='" + orderno + "' or (ORDERREFNO!='' and ORDERREFNO='" + orderno + "')");        if (dt.Rows.Count > 0)        {            DataTable dtbill = C_c.SelectT("select * from ODR_BillDetail  where ODR_OrderMainID='" + dt.Rows[0]["ODR_OrderMainID"].ToString() + " ' and Void_Flag='0'");            if (dtbill.Rows.Count > 0)            {                jsonResult = JsonConvert.SerializeObject(dtbill);             }        }        else        {}        return jsonResult;    }