csharp_tutorial_3.cs

static List<AdDetails> GetAdDetails(List<string> urls){
   var lstAdDetails = new List<AdDetails>();

   foreach (var url in urls){
       var htmlNode = GetHtml(url);
       var AdDetails = new AdDetails();

       AdDetails.AdTitle = htmlNode.OwnerDocument.DocumentNode.SelectSingleNode("//html/head/title").InnerText;
       var description = htmlNode.OwnerDocument.DocumentNode.SelectSingleNode("//html/body/section/section/section/section").InnerText;
       AdDetails.AdDescription = description.Replace("\n        \n            QR Code Link to This Post\n            \n        \n", "");
       AdDetails.AdUrl = url;
       lstAdDetails.Add(AdDetails);           
   }
   return lstAdDetails;
}