How read node from IIS config and convert into collection in C#?

I am hosting the test website in IIS . and configured W3C logging with custom field . config for my Testing site is

XML

    <site name="Testing" id="8" serverAutoStart="true">
      <application path="/">
        <virtualDirectory path="/" physicalPath="D:\Test\Test" />
      </application>
      <bindings>
        <binding protocol="http" bindingInformation="*:88:" />
      </bindings>
      <logFile logExtFileFlags="Date, Time, ClientIP, UserName, SiteName, ComputerName, ServerIP, Method, UriStem, UriQuery, HttpStatus, Win32Status, BytesSent, BytesRecv, TimeTaken, ServerPort, UserAgent, Cookie, Referer, ProtocolVersion, Host, HttpSubStatus" logFormat="W3C" logTargetW3C="File, ETW" period="Daily" enabled="true">
        <customFields>
          <clear />
          <add logFieldName="tttt" sourceName="ETag" sourceType="ResponseHeader" />
          <add logFieldName="ggg" sourceName="ETag" sourceType="ResponseHeader" />
          <add logFieldName="fff" sourceName="HTTP_VERSION" sourceType="ServerVariable" />
          <add logFieldName="ffff" sourceName="HTTP_VERSION" sourceType="ServerVariable" />
          <add logFieldName="ff" sourceName="Host" sourceType="RequestHeader" />
        </customFields>
      </logFile>
      <traceFailedRequestsLogging enabled="true" directory="C:\inetpub\logs\FailedReqLogFiles" />
    </site>

now i want to read the customFields node in above XML and convert its childElement add into Collection.Using below code i can read the customFields node but not able to convert the childElement add inside the customFields into collection .

c#

  using (ServerManager serverManager = new ServerManager())
    {

        Configuration config = serverManager.GetApplicationHostConfiguration();

        ConfigurationSection sitesSection = config.GetSection("system.applicationHost/sites");
        ConfigurationElementCollection sitesCollection = sitesSection.GetCollection();
        //this will return the node  with id=8
        ConfigurationElement siteElement = FindElement(sitesCollection, out siteName, "site", "id", @"8");
        ConfigurationElementCollection siteCollection = siteElement.GetCollection();
        ConfigurationElement logFileElement = siteCollection.GetChildElement("logFile");

         var customFields= logFileElement.GetCollection("customFields");
    }

how can i convert child node add inside the customFields node into collection in c#?