using HtmlAgilityPack;

using System;

public class Program

{

    public static void Main()

    {

        HtmlDocument doc = new HtmlDocument();

        var html = "<img src=\"https://thumbs.com/thumbs/test.mp4/test1.mp4-3.jpg\" foo=\"bar\" />";

        doc.LoadHtml(html);

        HtmlNode image = doc.DocumentNode.SelectSingleNode("//img");

​

        Console.WriteLine("src: {0}", image.Attributes["src"].Value);

        Console.WriteLine("foo: {0}", image.Attributes["foo"].Value);

        // Get the value of an attribute that may or may not be present, and supply a default value

        // if it isn't

        Console.WriteLine("bar: {0}", image.GetAttributeValue("bar", "default value"));

        Console.Read();

    }

}