using System;

using HtmlAgilityPack;

using System.Xml;

using System.Collections.Generic;

using System.Linq;

public class Program

{

    public static void Main()

    {

        HtmlWeb website = new HtmlWeb();

        HtmlAgilityPack.HtmlDocument rootDocument = website.Load("http://blogviet.com.vn");

        var nodes = rootDocument.DocumentNode.SelectNodes("//meta");

        if (nodes != null)

        {

            foreach (var node in nodes)

            {

                      if (node.Attributes["name"] != null && node.Attributes["content"] != null)

      {

                Console.WriteLine(node.Attributes["name"].Value);

                Console.WriteLine(node.Attributes["content"].Value);

      }

​

            }

        }

        else

        {

            Console.WriteLine("value is null");

        }

    }

}