Use AsyncCallback event to resolve a host name : DNS « Network « C# / CSharp Tutorial

1. C# / CSharp Tutorial
2. Network
3. DNS

using System;
using System.Drawing;
using System.Net;
using System.Text;
using System.Windows.Forms;

class MainClass
{
   private static void Resolved(IAsyncResult ar)
   {
      string buffer;

      IPHostEntry iphe = Dns.EndResolve(ar);

      buffer = "Host name: " + iphe.HostName;
      Console.WriteLine(buffer);

      foreach(string alias in iphe.Aliases)
      {
         buffer = "Alias: " + alias;
         Console.WriteLine(buffer);
      }
      foreach(IPAddress addrs in iphe.AddressList)
      {
         buffer = "Address: " + addrs.ToString();
         Console.WriteLine(buffer);
      }
   }

   public static void Main()
   {
      AsyncCallback OnResolved;

      OnResolved = new AsyncCallback(Resolved);

      string addr = "www.java2s.com";
      Object state = new Object();

      Dns.BeginResolve(addr, OnResolved, state);
   }
}