ADLib.ActiveDirectory.GetUserBySid C# (CSharp) Method

        public UserPrincipal GetUserBySid(object Sid)
        {
            BaseCriteria query = new BaseCriteria("objectSid", Sid.ToString());

            return Find(query).FirstOrDefault() as UserPrincipal;
        }

        /// <summary>
        /// Save the local ADUser data to the remote server
        /// </summary>
        public void Save()
        {
            if (isSaveable)
            {
                //Set password
                if (passwordChanged)
                {
                    _sourceUser.SetPassword(_password);
                    passwordChanged = false;
                }

                if (_sourceUser.Name == null || _sourceUser.DisplayName == null)
                {
                    _sourceUser.Name        = GivenName + " " + Surname;
                    _sourceUser.DisplayName = _sourceUser.Name;
                }
                Boolean wasNewUser = _isNewUser;

                try
                {
                    _sourceUser.Save();

                    //Save data to AD
                    if (_isNewUser)
                    {
                        directoryEntry = _sourceUser.GetUnderlyingObject() as DirectoryEntry;
                    }
                    _isNewUser = false;
                }
                catch (PrincipalExistsException ex)
                {
                    throw new DuplicateUser(ex.Message);
                }

                Sync_Groups();

                //Have to reload the UserPrincipal to get the DirectoryEntry
                UserPrincipal newSourceUser = _connection.GetUserBySid(_sourceUser.Sid);

                //if (wasNewUser)
                //{

                if (newSourceUser == null)
                {
                    string msg = "Couldn't reload user: "******"manager"].Value)))
                {
                    if (directoryEntry.Properties.Contains("manager"))
                    {
                        directoryEntry.Properties["manager"].Value = this.Manager.DistinguishedName;
                    }
                    else
                    {
                        directoryEntry.Properties["manager"].Add(this.Manager.DistinguishedName);
                    }
                }

                if (DisplayName != directoryEntry.Properties["cn"].Value as string)
                {
                    directoryEntry.Rename("CN=" + DisplayName);
                }


                try
                {
                    directoryEntry.CommitChanges();
                }
                catch (DirectoryServicesCOMException ex)
                {
                    System.Diagnostics.Debug.Write(ex.Message + " - " + ex.StackTrace);
                    throw new ADException(String.Format("DirectoryServicesCOMException {0}", ex.Message), ex);
                }

                if (this.HideFromAddressLists)
                {
                    try
                    {
                        if (!directoryEntry.Properties.Contains("msExchHideFromAddressLists"))
                        {
                            directoryEntry.Properties["msExchHideFromAddressLists"].Add("TRUE");
                        }
                        else
                        {
                            directoryEntry.Properties["msExchHideFromAddressLists"].Value = "TRUE";
                        }

                        directoryEntry.CommitChanges();
                    }
                    catch (DirectoryServicesCOMException)
                    {
                    }
                }
            }
        }