csharp - retrieve LDAP

 DirectoryEntry de = new DirectoryEntry("LDAP://10.10.10.10:389");
             DirectorySearcher searcher = new DirectorySearcher(de, string.Format("(&(objectClass=user)(samAccountName={0}))", "A00106"));
             SearchResultCollection src = searcher.FindAll();
             foreach (SearchResult rs in src)
             {
                 if (rs != null)
                 {
                     string n = (rs.GetDirectoryEntry().Properties["distinguishedName"].Value == null) ? string.Empty : rs.GetDirectoryEntry().Properties["distinguishedName"].Value.ToString();
                     if (n.IndexOf("OU") != -)
                     {
                         //displayName,sAMAccountName,name,mail
                         string email = (rs.GetDirectoryEntry().Properties["mail"].Value == null) ? string.Empty : rs.GetDirectoryEntry().Properties["mail"].Value.ToString();
                     }
                 }
             }

// verify user / password

private string GetEmployeeIDByLDAP(string userName, string password)
        { // TODO: Extract
            DirectoryEntry directoryEntry = new DirectoryEntry("LDAP://66.66.66.66:389")
            {
                Username = userName,
                Password = password,
                AuthenticationType = AuthenticationTypes.Secure
            };
            try
            {
                DirectorySearcher searcher = new DirectorySearcher(directoryEntry)
                {
                    Filter = string.Format("(&(objectClass=user)(samAccountName={0}))", userName)
                };
                SearchResult result = searcher.FindOne();
                if (result != null)
                {
                    string empid = result.Properties["name"][].ToString();
                    return empid;
                }
            }
            catch (Exception err)
            {
                _logger.Error(err);
            }

            return string.Empty;
        }