csharp

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") != -1)
                    {
                        //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"][0].ToString();
                    return empid;
                }
            }
            catch (Exception err)
            {
                _logger.Error(err);
            }

            return string.Empty;
        }