C# HTML Agility Pack SelectSingleNode and SelectNodes XPath syntax -


my question similar 1 xmlnode.selectsinglenode syntax search within node in c#

i'm trying use html agility pack pull price/condition/ship price... here's url scraping: http://www.amazon.com/gp/offer-listing/0470108541/ref=dp_olp_used?ie=utf8&condition=all

here's snippet of code: 

    string results = "";     var w = new htmlweb();     var doc = w.load(url);     var nodes = doc.documentnode.selectnodes("//div[@class='a-row a-spacing-medium olpoffer']");      if (nodes != null)     {          foreach (htmlnode item in nodes)          {               var price = item.selectsinglenode(".//span[@class='a-size-large a-color-price olpofferprice a-text-bold']").innertext;               var condition = item.selectsinglenode(".//h3[@class='a-spacing-small olpcondition']").innertext;               var price_shipping = item.selectsinglenode("//span[@class='olpshippingprice']").innertext;               results += "price " + price + " condition " + condition + " ship " + price_shipping + "\r\n";          }     }     return results;

no matter combination try of .// , . , ./ , / etc... cannot want (just trying learn xpaths), returning 1st item on , on , over, original question referenced earlier. think i'm missing fundamental understanding of how selecting nodes work and/or considered node.

update

ok, i've changed url point different book , first 2 items working expected... when try change third item (price_shipping) ".//" absolutely no information being pulled anything. must due sometime there not shipping price , span omitted. how handle this? tried if price_shipping !=null.

update

solved. removed ".innertext" price_shipping causing issues when null... did null check , safe use .innertext.

solved. removed ".innertext" price_shipping causing issues when null... did null check , safe use .innertext.


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