using System.Net;
using System.Net.Sockets;

        public static void connect1(string host, int startPort, int finishPort)
        {

            IPAddress[] IPs = Dns.GetHostAddresses(host);
            Socket s = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
            Console.WriteLine("Establishing Connection to {0}", host);

            for (int curPort = startPort; curPort <= finishPort; curPort++)
            {

                try
                {
                    s.Connect(IPs[0], curPort);
                    Console.WriteLine("Port {0} : opened", curPort);
                }
                catch
                {
                    Console.WriteLine("Port {0} : blocked", curPort);
                }
            }
        }