CLIENT SOCKET - NDDCoder

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int kt;
byte[] dl = new byte[1024];
Socket sk = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);

IPEndPoint serverInfo = new IPEndPoint(IPAddress.Loopback, 9000);
EndPoint Server = (EndPoint) serverInfo;

Console.WriteLine("Connecting to server");

dl = getByte("Hello");
sk.SendTo(dl, dl.Length, SocketFlags.None, Server);

dl = new byte[1024];
kt = sk.ReceiveFrom(dl, ref Server);
Console.WriteLine(getString(dl, 0, kt));

while (true)
{

//nhap du lieu
    string input = Console.ReadLine();
    if (input == "exit")
    {
        break;
    }

dl = getByte(input);
    sk.SendTo(dl, dl.Length, SocketFlags.None, Server);

dl = new byte[1024];
    //nhan lai du lieu
    kt = sk.ReceiveFrom(dl, ref Server);
    string s = getString(dl, 0, kt);
    if (s.Length == 0)
    {
        break;
    }
    Console.WriteLine(s.Trim());
}
sk.Close();
Console.WriteLine("Stopped");
Console.ReadLine();

public static void log(string a)
        {
            Console.WriteLine(a);
        }