/// <summary>
        /// Handle single user.
        /// </summary>
        /// <param name="entry">User LDAP object.</param>
        private void HandleUser(SearchResultEntry entry)
        {
            // Create CMS object from LDAP object
            var user = new User(
                LdapHelper.GetObjectGuid(entry),
                LdapHelper.GetAttributeString(entry.Attributes["name"], true),
                LdapHelper.IsUserEnabled(entry),
                UserBindings.Select(k => new KeyValuePair <string, string>(k.Cms, LdapHelper.GetAttributeString(entry.Attributes[k.Ldap]))).ToList());

            // Find existing object in LDAP replica
            var existing = Replica.Users.FirstOrDefault(u => u.Guid == user.Guid);

            if (LdapHelper.IsDeleted(entry))
            {
                if (existing != null)
                {
                    // Remove user
                    Sender.RemoveUser(existing);
                    Replica.Users.Remove(existing);
                }
            }
            else if (existing != null)
            {
                // Check if any attribute has changed
                var userXml = Sender.GetUser(user.Guid);

                if (!string.IsNullOrEmpty(userXml))
                {
                    bool userChanged =
                        User.InternalBindings.Any(
                            b =>
                            RestHelper.GetAttributeFromReponse(userXml, b.Value) !=
                            ((b.Key == "userAccountControl" ? LdapHelper.IsUserEnabled(entry).ToString().ToLowerInvariant() : LdapHelper.GetAttributeString(entry.Attributes[b.Key], b.Key == "name")) ?? string.Empty));
                    userChanged |=
                        UserBindings.Any(
                            b =>
                            RestHelper.GetAttributeFromReponse(userXml, b.Cms) !=
                            (LdapHelper.GetAttributeString(entry.Attributes[b.Ldap]) ?? string.Empty));

                    if (userChanged)
                    {
                        // Modify user
                        Sender.ModifyUser(user);
                    }
                }
            }
            else
            {
                // Add user
                long?userId = Sender.AddUser(user);

                if (userId != null)
                {
                    user.Id = userId.Value;
                    user.DistinguishedName = entry.DistinguishedName;
                    Replica.Users.Add(user);
                }
            }
        }