How do I get a list of members in a particular Active Directory group in C#.NET

Here is the LDIFDE command (LDAP query).

I am not a C# coder - but it may help.

Say your domain is DomainName.Domain.Com
The container is ContainerName

ldifde -f D:\ldif_grpexport.ldf -d "OU=ContainerName,OU=DomainName,DC=Domain,DC=Com" -r "(&(objectCategory=group)(displayName=name-of-group))" -l "DN,objectClass,cn,displayName"

Use Code:

using System.DirectoryServices;

ArrayList GetADGroupUsers(string groupName)
{    
   SearchResult result;
   DirectorySearcher search = new DirectorySearcher();
   search.Filter = String.Format("(cn={0})", groupName);
   search.PropertiesToLoad.Add("member");
   result = search.FindOne();

   ArrayList userNames = new ArrayList();
   if (result != null)
   {
       for (int counter = 0; counter < 
          result.Properties["member"].Count; counter++)
       {
           string user = (string)result.Properties["member"][counter];
               userNames.Add(user);
       }
   }
   return userNames;
}

Reference :

http://www.codeproject.com/KB/system/QueryADwithDotNet.aspx

I tried this one and it didnt work. Maybe becouse it is from 2005 and I use Framework 4.0.

Are you referring to a Security Group, like "Domain Admins", or an Organizational Unit (i.e. the containers in the tree, on the left, when viewing in Active Directory Users & Computers)?  There are distinctly different things, and the code will be different for each.

tgerbert,

Yes, im talking about security groups. I setup a new security group which is a role in my app. In one case I need to check if user logged to his computer attached to the domain is in the group and also I need to list members from this group.

Here's a simple console application example:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.DirectoryServices;
using System.Collections;

namespace ConsoleApplication1
{
	class Program
	{
		static void Main(string[] args)
		{
			string[] users = GetGroupMembers(Environment.UserDomainName, "Domain Admins");

			foreach (string user in users)
				Console.WriteLine(user);

			Console.ReadKey();
		}

		static string[] GetGroupMembers(string DomainName, string GroupName)
		{
			List<string> members = new List<string>();

			// Get the group's directory entry
			using (DirectoryEntry group = new DirectoryEntry(String.Format("WinNT://{0}/{1},group", DomainName, GroupName)))
			{

				// Add members' names to members list
				foreach (object member in (IEnumerable)group.Invoke("Members"))
				{
					using (DirectoryEntry memberEntry = new DirectoryEntry(member))
					{
						members.Add(memberEntry.Name);
					}
				}
			}

			return members.ToArray();
		}
	}
}

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Is there a method to get a user accout attributes like Name, Surname, Email etc. ?

Do you mean you want to get these details while listing the members of a group? Or separately on a user-by-user basis?