Search active users from AD

    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("Select active users from AD:");
            using (var context = new PrincipalContext(ContextType.Domain, "mydomain.com.nt", "OU=Departments,DC=com,DC=nt"))
            {   
                DirectoryEntry ldapConnection = new DirectoryEntry("LDAP://mydomain.com.nt/OU=Departments,DC=or,DC=nt", @"User_name", "password", AuthenticationTypes.Delegation);
                DirectorySearcher search = new DirectorySearcher(ldapConnection);
                search.Filter = "(&(objectCategory=person)(objectClass=user)(!userAccountControl:1.2.840.113556.1.4.803:= 2))";
              search.PropertiesToLoad.Add("distinguishedName");
                search.PropertiesToLoad.Add("whenCreated");
                search.PropertiesToLoad.Add("description");
                search.PropertiesToLoad.Add("operatingSystem");
                search.PropertiesToLoad.Add("name");
                SearchResult result;
                List<Users> lstADUsers = new List<Users>();
                SearchResultCollection resultCol = search.FindAll();
                if (resultCol != null)
                {
    for (int counter = 0; counter < resultCol.Count; counter++)
                    {
       string UserNameEmailString = string.Empty;
                        result = resultCol[counter];
                        if (result.Properties.Contains("samaccountname") &&
                                 result.Properties.Contains("mail") &&
                            result.Properties.Contains("displayname"))
                        {
        Users objSurveyUsers = new Users();
            objSurveyUsers.Email = (String)result.Properties["mail"][0] +
                              "^" + (String)result.Properties["displayname"][0];
                            objSurveyUsers.UserName = (String)result.Properties["samaccountname"][0];
                            objSurveyUsers.DisplayName = (String)result.Properties["displayname"][0];
                            lstADUsers.Add(objSurveyUsers);
                        }
                    }
                }
            }
        }
        public class Users
        {
            public string Email { get; set; }
            public string UserName { get; set; }
            public string DisplayName { get; set; }
            public bool isMapped { get; set; }
        }
    }
}