using System;

using System.Net;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello World");

        HttpWebRequest myReq = (HttpWebRequest)WebRequest.Create("http://www.contoso.com/");

        myReq.ServerCertificateValidationCallback += (sender,cert,chain,policyErrors) => 

        {

            Console.WriteLine(cert.GetCertHashString());

            return true;

        };

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

        response.Close();

    }

}