How to get IP address (using C#) of my computer that situated in Local Area Network, that use 1 workGroup (NO DNS and other such services) and how can I take IP addresses or HostNames of other computers that work in this networks too.

 public string[] getUserandHostDetails()
        {
            string[] result = new string[5];
            result[0] = Dns.GetHostName().ToString(); //ComputerName;
            result[1] = GetIPAddress().ToString(); //IP Address;
            result[2] = WindowsIdentity.GetCurrent().Name.ToString(); //UserName
            result[3] = TimeZone.CurrentTimeZone.StandardName; //TimeZone

            return result;
        }
        private string GetIPAddress()
        {
            string strHostName = System.Net.Dns.GetHostName();
            IPHostEntry ipEntry = Dns.GetHostEntry(strHostName);
            IPAddress[] addr = ipEntry.AddressList;

            for (int i = 0; i < addr.Length; i++)
            {
                return addr[i].ToString();
            }
            return "0";

        }