1        private void ListMembersInGroup(string ComputerName, string GroupName)
2        {
3            // Based on examples from http://bytes.com/forum/thread259945.html
4      	
5            // Connect to a local server using the WinNT provider interface
6            using (DirectoryEntry groupEntry = new DirectoryEntry(string.Format("WinNT://{0}/{1},group", ComputerName, GroupName)))
7            {
8                object members = groupEntry.Invoke("Members");
9                foreach (object member in (IEnumerable)members)
10                {
11                    DirectoryEntry de = new DirectoryEntry(member);
12                    Console.WriteLine("ADsPath " + de.Path + " Name: " + de.Name);
13                }
14            }
15        }

using System.DirectoryServices;