c# - External Web page is not loading everytime in htmlagility pack -

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i using htmlagilitypack scrape part of webpage. getting actual output not always.

htmlagilitypack.htmlweb web = new htmlweb();  web.useragent = "mozilla/5.0 (windows; u; windows nt 5.1; en-us; rv:1.8.0.4) gecko/20060508 firefox/1.5.0.4"; htmlagilitypack.htmldocument doc = web.load(url); var resultpricetable = doc.documentnode.selectnodes("//div[@class='resultsset']//table");

resultpricetable coming null in cases(nearly 50%).from debugging found 

htmlagilitypack.htmldocument doc = web.load(url);

is causing issue. not loading url. how fix issue ?

thanks in advance.

try load page via webclient or httpwebrequest/httpwebresponse , send result htmlagilitypack

this code sample try download page 5 time if empty string or webexception

in production code don't skip exceptions, need handle (or @ least log it)

sample:

string html = string.empty;             int tries = 5;             while (tries > 0)             {                 using (var client = new webclient())                 {                      string url = "http://google.com/";                     client.headers.add(httprequestheader.useragent, "mozilla/5.0 (windows; u; windows nt 5.1; en-us; rv:1.8.0.4) gecko/20060508 firefox/1.5.0.4");                     try                     {                        html = client.downloadstring(url);                         tries--;                         if (!string.isnullorempty(html))                         {                             break;                         }                     }                     catch (webexception)                     {                         tries--;                     }                 }             }             htmlagilitypack.htmldocument doc = new htmlagilitypack.htmldocument();             doc.loadhtml(html);

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