Avoiding a NullReferenceException
- by Nikhil K
I have used this code for extracting urls from web page.But in the line of 'foreach' it is showing
Object reference not set to an instance of an object
exception. What is the problem? how can i correct that?
WebClient client = new WebClient();
string url = "http://www.google.co.in/search?hl=en&q=java&start=10&sa=N";
string source = client.DownloadString(url);
HtmlDocument doc = new HtmlDocument();
doc.LoadHtml(source);
foreach (HtmlNode link in doc.DocumentNode.SelectNodes("//a[@href and @rel='nofollow']"))
{
Console.WriteLine(link.Attributes["href"].Value);
}
