how to fetch all the contents from web url

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C#

HTML

I want to fetch all the content from website(any website). I have the following code but it is not 100% correct.

using (var client = new System.Net.WebClient())
    {
        var filename = System.IO.Path.GetTempFileName();
        client.DownloadFile("http://www.cnn.com", filename);
        var doc = new HAP.HtmlDocument();
        doc.OptionDefaultStreamEncoding = Encoding.UTF8;
        doc.Load(filename);

        var root = doc.DocumentNode;
        var a_nodes = root.Descendants("a").ToList();


        foreach (var a_node in a_nodes)
        {
            Console.WriteLine();
            Console.WriteLine(a_node.InnerText.Trim());
        }
    }

    Console.ReadKey();

Now I have used just

<a>

tag here but I am not sure how to get data from other tags all together.

Any suggestons!!