Getting users for an AD Group

Scenario:
For one of our requirements , We needed to pull all the users for a specific AD Group.

Solution:
You know me , right.. always ready to code something... :-)

Note:
I am using HostingEnvironment.Impersonate() to be able to make the code run ASP.Net Application Pool context. If you are using it from console application, you may not need this.

Code:

using System;
using System.Collections.Generic;
using System.Text;
using System.DirectoryServices;
using System.Reflection;
using System.Web.Hosting;

  public static List<string> GetGroupMembers(string domainName, string ADConnectionString, string strGroup)
        {
           List<string> groupMembers = new List<string>();

            try{
            using (HostingEnvironment.Impersonate())
            {
                if (string.IsNullOrEmpty(ADConnectionString))
                    throw new Exception("ADConnectionString value is Empty");

                //connects to the given AD based on given AD string
                DirectoryEntry ent = new DirectoryEntry("LDAP://" + ADConnectionString);

                //ones connected to the AD it searches for given/named group
                DirectorySearcher srch = new DirectorySearcher("(CN=" + strGroup + ")");
                             
                SearchResult rs = srch.FindOne();

                ResultPropertyCollection resultPropColl = rs.Properties;

                foreach (Object memberColl in resultPropColl["member"])
                {
                    //get the info about specific AD user from AD
                    DirectoryEntry gpMemberEntry = new DirectoryEntry("LDAP://" + memberColl);

                    // PrintDirectoryEntryProperties(gpMemberEntry);
                    System.DirectoryServices.PropertyCollection userProps = gpMemberEntry.Properties;

                    object objVal = userProps["sAMAccountName"].Value;
                    
                    if (null != objVal)
                    {
                        if (gpMemberEntry.SchemaClassName == "user")
                        {
                            groupMembers.Add(domainName + "\\" + objVal.ToString());
                        }
     //else
     //{
     //// Un-comment and test this section for recursively finding users     
    //  groupMembers.AddRange(GetGroupMembers(domainName, ADConnectionString, objVal.ToString()));
     //}
                    }
                }
            }
         }
         catch (Exception ex)
                 {
                  //   Log.Error(ex.ToString());
                 }
               return groupMembers;
      }

Articles:
Impersonation