Code show lots of waiting

Hi Developer,

Below is my code not working properly please help.

problem is when i am passed the right server name then if work fine but when pass wrong server name then show lots of waiting. I don't what happen.

const string ntpServer = "pool.ntp.org";

var ntpData = new byte[48];

ntpData[0] = 0x1B; //LeapIndicator = 0 (no warning), VersionNum = 3 (IPv4 only), Mode = 3 (Client Mode)

var addresses = Dns.GetHostEntry(ntpServer).AddressList;

var ipEndPoint = new IPEndPoint( addresses[0] , 123);

var socket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);

socket.Connect(ipEndPoint);

socket.Send(ntpData);

socket.Receive(ntpData);

socket.Close();

ulong intPart = (ulong)ntpData[40] << 24 | (ulong)ntpData[41] << 16 | (ulong)ntpData[42] << 8 | (ulong)ntpData[43];

ulong fractPart = (ulong)ntpData[44] << 24 | (ulong)ntpData[45] << 16 | (ulong)ntpData[46] << 8 | (ulong)ntpData[47];

var milliseconds = (intPart * 1000) + ((fractPart * 1000) / 0x100000000L);

var networkDateTime = (new DateTime(1900, 1, 1)).AddMilliseconds((long)milliseconds);

Label1.Text = networkDateTime.ToString();

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