DirectoryEntry.NativeObject throws access denied for a user in Administrators group in windows 2008

using System;
using System.DirectoryServices;

namespace nanttest
{
    class Program
    {
    	public static void Main(string[] args)
    	{
    		using(DirectoryEntry entry = new DirectoryEntry("IIS://localhost/W3SVC"))
    		{
    			object absobject = entry.NativeObject;
    			Console.WriteLine("Name: {0}", entry.Name);
    		}

    		Console.Write("Press any key to continue . . . ");
    		Console.ReadKey(true);
    	}
    }
}