DnsQuery.cs

using System;
using System.Diagnostics;
using System.Linq;
using System.Net;
using System.Net.Sockets;

namespace DnsCall
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("Hello World!");
            Socket socket = new Socket(SocketType.Dgram, ProtocolType.Udp);
            EndPoint endPoint = new IPEndPoint(IPAddress.Parse("8.8.8.8"), 53);
            string hexMessage = "AAAA01000001000000000000076578616d706c6503636f6d0000010001";
            hexMessage = "AA AA 01 00 00 01 00 00 00 00 00 00 0A 6A 6F 68 61 6E 6E 6F 74 65 73 03 63 6F 6D 00 00 01 00 01".Replace(" ", "");
            byte[] bytes = StringToByteArray(hexMessage);
            socket.SendTo(bytes, endPoint);
            byte[] buffer = new byte[255];
            int len = socket.ReceiveFrom(buffer, ref endPoint);
            byte[] responseBytes = new byte[len];
            Array.Copy(buffer, responseBytes, len);
            string response = BitConverter.ToString(responseBytes);
            Debug.WriteLine(response);
        }

        public static byte[] StringToByteArray(string hex)
        {
            return Enumerable.Range(0, hex.Length)
                             .Where(x => x % 2 == 0)
                             .Select(x => Convert.ToByte(hex.Substring(x, 2), 16))
                             .ToArray();
        }
    }
}