using System;

using System.Collections.Generic;

using System.Net;

using System.Data.Linq;

using System.Data.Linq.Mapping;

​

class RequestState

{

    public HttpWebRequest request = null;

    public HttpWebResponse response = null;

}

​

public class Program

{

    public static void Main()

    {

        List<string> urls = new List<string>()

        {"http://www.error404aad.com/", "https://za.indeed.com/jobs?q=HR%20Administrator&vjk=5b2201400cca2ac2", "http://www.error404wrg.com/"};

        List<string> failed = new List<string>();

        foreach (var url in urls)

        {

            try

            {

                HttpWebRequest req = (HttpWebRequest)WebRequest.Create(url);

                req.Method = "HEAD";

                HttpWebResponse response = (HttpWebResponse)req.GetResponse();

                // test for certain status codes below

                response.Close();

            }

            catch (Exception e)

            {

                failed.Add(url);

            }

        }

​

            Console.WriteLine("url(s) to be removed: " + "" + String.Join(", ", failed));

    }

​

    public static void ResponseCallback(IAsyncResult asyncResult)

    {

        Console.WriteLine("Completed");

    }

}