PS1 | UDP Client

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Net.Sockets;
using System.Text;
using System.Threading.Tasks;

namespace UDP_Client
{
    class Client
    {
        public static void Main()
        {
            string strIpAddress, menuOption;
            IPAddress IpAddress = null;
            Boolean tryAgain = true;
            UdpClient udpclient = new UdpClient();
            drawMenu();

            Console.WriteLine("What do you want to do?");
            Console.WriteLine("\t1.\tMulticast\n\t2.\tBroadcast\n\tAny.\tExit");
            Console.Write("Your choice: ");

            menuOption = Console.ReadLine();
            if (menuOption.Equals("1"))
            {
                while (tryAgain)
                {
                    tryAgain = true;
                    Console.Write("Enter multicast address: ");
                    strIpAddress = Console.ReadLine();
                    try
                    {
                        IpAddress = IPAddress.Parse(strIpAddress);
                        if (!isAddressValid(IpAddress))
                        {
                            Console.WriteLine("Wrong multicast address, try again.");
                            tryAgain = true;
                        }
                        else tryAgain = false;
                    }
                    catch (FormatException e)
                    {
                        Console.WriteLine("Wrong IP address, try again.");
                        tryAgain = true;
                    }
                }

                udpclient.JoinMulticastGroup(IpAddress);
            }
            else if (menuOption.Equals("2"))
            {
                strIpAddress = "255.255.255.255";
                IpAddress = IPAddress.Parse(strIpAddress);
            }
            else System.Environment.Exit(-1);

            IPEndPoint remoteep = new IPEndPoint(IpAddress, 2222);
            Console.WriteLine("Send messages:");
            string text = "";
            while (true)
            {
                Console.Write("Text:");
                text = Console.ReadLine();
                if (String.IsNullOrEmpty(text)) break;
                byte[] data = Encoding.Unicode.GetBytes(text);
                udpclient.Send(data, data.Length, remoteep);

                Console.Write("rn");
            }
        }

        public static bool isAddressValid(IPAddress address)
        {
            IPAddress lowerAddress = IPAddress.Parse("224.0.0.0");
            IPAddress higherAddress = IPAddress.Parse("239.255.255.255");
            byte[] lowerBytes = lowerAddress.GetAddressBytes();
            byte[] upperBytes = higherAddress.GetAddressBytes();
            byte[] addressBytes = address.GetAddressBytes();

            bool lower = true, higher = true;

            for (int i = 0; i < lowerBytes.Length && (lower || higher); i++)
            {
                if ((lower && addressBytes[i] < lowerBytes[i]) || (higher && addressBytes[i] > upperBytes[i]))
                    return false;

                lower &= (addressBytes[i] == lowerBytes[i]);
                higher &= (addressBytes[i] == upperBytes[i]);
            }

            return true;
        }

        public static void drawMenu()
        {
            Console.WriteLine("\n\t******************************");
            Console.WriteLine(  "\t*          UDP Client        *");
            Console.WriteLine(  "\t******************************\n");
        }
    }
}