DnsPermission DnsP = new DnsPermission(System.Security.Permissions.PermissionState.Unrestricted);
             DnsP.IsUnrestricted();
   string ComputerName = Dns.GetHostName();
   IPHostEntry myHost = new IPHostEntry();
   myHost = Dns.Resolve(ComputerName);
   Console.WriteLine("计算机的名字是:{0}",ComputerName);
   Console.WriteLine("IP is :");
   for(int i =0;i<myHost.AddressList.Length;i++)
   {
    Console.WriteLine("{0}",myHost.AddressList[i].ToString());
   }
   Console.ReadLine();