C#

public static void Main()
{
    string[] names = { "Omar", "-232" , "Don" , "Test"};
    string theSelected = string.Join(" " , names);

    Console.WriteLine("The Avilable names are : " + theSelected);
    Console.WriteLine("Which name you need ? ");
point: string Selected = Console.ReadLine();
    string[] first = Array.FindAll(names, namess => namess.ToLower().StartsWith(Selected.ToLower(), StringComparison.Ordinal));
    int i = 4;
   if (!(Selected == "") && !(Selected.StartsWith(" ")))
    {
        if (theSelected.ToLower().Contains(Selected.ToLower()))
        {
            Console.WriteLine("The names start with " + Selected.ToUpper() + " is / are : \n" + string.Join("\n", first));
        }
        else
        {
            Console.WriteLine("The names start with " + Selected + " is / are : \nNone");

        }
    }
    else
    {
        Console.WriteLine("The Avilable names are : " + theSelected);
        goto point;
    }
    Console.ReadKey();
}

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

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            IPEndPoint local1 = new IPEndPoint(IPAddress.Parse("172.168.0.10"), 20001);
            IPEndPoint local2 = new IPEndPoint(IPAddress.Parse("172.168.0.10"), 20002);
            IPEndPoint remote = new IPEndPoint(IPAddress.Parse("172.168.0.18"), 10002);
            byte[] request = new byte[] { 0x10, 0x7B, 0xFE, 0x79, 0x16 };

            Test(local1, remote, request); // Works
            Test(local1, remote, request); // Failes
            Test(local2, remote, request); // Works
        }

        static void Test(IPEndPoint local, IPEndPoint remote, byte[] request)
        {
            byte[] response = new byte[0];
            TcpClient tcp = new TcpClient();
            NetworkStream stream = null;

            try
            {
                tcp.Client.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReuseAddress, true);
                tcp.Client.Bind(local);
                tcp.Connect(remote);

                stream = tcp.GetStream();
                stream.Write(request, 0, request.Length);

                Thread.Sleep(500);

                response = new byte[tcp.Available];
                stream.Read(response, 0, response.Length);
            }
            catch (SocketException soe)
            {
                Console.WriteLine(soe.ErrorCode);
                Console.WriteLine(soe.SocketErrorCode);
                Console.WriteLine(soe.Message);
            }
            catch (Exception e)
            {
                Console.WriteLine(e.Message);
            }
            finally
            {
                if (tcp.Connected)
                {
                    tcp.Client.Shutdown(SocketShutdown.Both);
                }

                tcp.Close();

                if (stream != null)
                {
                    stream.Close();
                }
            }

            Console.WriteLine("Received: {0} byte(s)", response.Length);
        }
    }
}