get all users from a group in Active Directory

Question

I'm trying to get all users of a particular group in AD, then return a list of Employees as mapped to properties in my Employee class. I have:

My Filter is producing no results - what should it be?

Also, I tried the first solution here: List of users in specific Active Directory Distribution Group, but I need details such as mobile, extension, etc. which I couldn't get with that method.

public static List<Employee> CreateEmployeeList(string department) {     List<Employee> employees = new List<Employee>();     string filter = string.Format("(&(ObjectClass=person)(memberOf=CN={0},OU=Users & Groups,OU=Blah,DC=Blah,DC=Blah,DC=Blah))", department);      DirectoryEntry adRoot = new DirectoryEntry("LDAP://" + domain, null, null, AuthenticationTypes.Secure);     DirectorySearcher searcher = new DirectorySearcher(adRoot);     searcher.SearchScope = SearchScope.Subtree;     searcher.ReferralChasing = ReferralChasingOption.All;     searcher.Filter = filter;     SearchResultCollection results = searcher.FindAll();      foreach (SearchResult user in results)     {         // do whatever you need to do with the entry          if (user != null)         {             UserDirectoryEntry = user.GetDirectoryEntry();             string displayName = GetUserProperty("displayName");             string firstName = GetUserProperty("givenName");             string lastName = GetUserProperty("sn");             string email = GetUserProperty("mail");             string tel = GetUserProperty("telephonenumber");             string extension = GetUserProperty("ipphone");             string mobile = GetUserProperty("mobile");             string title = GetUserProperty("description");             employees.Add(new Employee{ FullName = displayName, FirstName = firstName, Surname = lastName, Email = email.ToLower(), Telephone = tel, Extension = extension, Mobile = mobile, JobTitle = title });         }     }     return employees; } 

Answer 1

using (var context = new PrincipalContext(ContextType.Domain, "domainName")) {     using (var group = GroupPrincipal.FindByIdentity(context, "groupName"))     {         if (group == null)         {             MessageBox.Show("Group does not exist");         }         else         {             var users = group.GetMembers(true);             foreach (UserPrincipal user in users)             {                  //user variable has the details about the user              }         }      } }