Parsing html links by html agility pack in c# -


i'm new in c#. need pars link category , subcategory.

i have category, when try take subcategory have error:

"object reference not set instance of object".

my code:

foreach (var link in xpathlinks)         {                  okno.text += link.attributes["href"].value + "\n";                 string doc2 = htmlpage.downloadstring("htmlpage" + link.                     attributes["href"].value);                 dokument2.loadhtml(doc2);                 htmlnodecollection xpathlinks2 = dokument2.documentnode.                     selectnodes("//ul[@class='category-nav']//li//a");                 foreach (var link in xpathlinks2)                 {                     okno.text += link.attributes["href"].value + "\n";                 }              }         }

i'm usin htmlagilitypack. error in xpathlinks2.


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