private News ParseNode(HtmlNode node)
{
HtmlNode header = node.SelectSingleNode("h3");
HtmlNodeCollection pharagraps = node.SelectNodes("p");
string title = header.InnerText.Trim();
string content = pharagraps.Aggregate(string.Empty, (current, pharagraph) => current + ParsePharagraph(pharagraph));
return(new News(title, content));
}