C#html parsing using htmlAgilitypack

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C#

HTML

HTTP

parsing

I have the following code in C# but it is not working. I am new to the whole C# and parsing thing but I need to get this working. Anyone knows why i am getting:"Object reference not set to an instance of an object."

using System.Text;
using HtmlAgilityPack;

namespace HtmlParser
{
    class Program
    {
        static void Main(string[] args)
        {
            // The HtmlWeb class is a utility class to get the HTML over HTTP
            HtmlWeb htmlWeb = new HtmlWeb();

            // Creates an HtmlDocument object from an URL
            HtmlAgilityPack.HtmlDocument document = htmlWeb.Load("http://allrecipes.com/search/default.aspx?w0=chicken&w1=beef");

            // Targets a specific node
            HtmlNode content_wrapper = document.GetElementbyId("content-wrapper");

            System.Console.WriteLine(content_wrapper.ToString());
            HtmlNodeCollection search_results = content_wrapper.SelectNodes("//div[@class='searchResult']");
            foreach (HtmlNode result in search_results)
            {
                string recipe_name = result.SelectSingleNode("*[@class='resultTitle']").InnerText;// error appears here
                System.Console.WriteLine(recipe_name);
            }
            System.Console.ReadKey();
        }
    }
}

[Edit]Code block added[/Edit]