ConfigSections

  <configSections>  
        <section name="HostInfo" type="System.Configuration.SingleTagSectionHandler"/>
    </configSections>

 IDictionary hostSetting = (IDictionary)ConfigurationManager.GetSection("HostInfo");
            //IDictionary hostSetting = (IDictionary)ConfigurationSettings.GetConfig("HostInfo");
            string hostName = (string)hostSetting["hostname"];
            int port =Convert.ToInt16(hostSetting["port"]);