Get the error: "Object reference not set to an instance of an object"

Hi

I have this code:
        private void bbGetHtml_ItemClick(object sender, DevExpress.XtraBars.ItemClickEventArgs e)
        {
            HtmlAgilityPack.HtmlDocument page = new HtmlWeb().Load("https://www.xxx.nl/search/process_result.phtml?mypref_search_id=0");
            var pageLinks = page.DocumentNode.SelectNodes("//class[@class='mtcMemberNotGreylisted']//a");
            foreach (var link in pageLinks)
            {
                txtResult.Text = link.Attributes["title"].Value;
            }
        }

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But i get the error at the Foreach-line: "Object reference not set to an instance of an object"
What does this mean and who can help me?

Greetings, Peter Kiers
LVL 1
Peter KiersOperatorAsked:
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AndyAinscowFreelance programmer / ConsultantCommented:
You need to check you have any pageLinks:
        private void bbGetHtml_ItemClick(object sender, DevExpress.XtraBars.ItemClickEventArgs e)
        {
            HtmlAgilityPack.HtmlDocument page = new HtmlWeb().Load("https://www.xxx.nl/search/process_result.phtml?mypref_search_id=0");
            var pageLinks = page.DocumentNode.SelectNodes("//class[@class='mtcMemberNotGreylisted']//a");
if(pageLinks != null)
{
            foreach (var link in pageLinks)
            {
                txtResult.Text = link.Attributes["title"].Value;
            }
}
        }

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Peter KiersOperatorAuthor Commented:
Thanks
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