private void StartButton_Click(object sender, EventArgs e)
        {
            StartButton.Enabled = false;
            var table         = DB.VoteLog.Log301Redirect.GetAllData();
            var urlNormalizer = new UrlNormalizer();

            foreach (var row in table)
            {
                //if (Count >= 1000) return;
                Count++;
                try
                {
                    UriFrom = new Uri(row.PageFrom);
                    UriTo   = new Uri(row.PageTo);
                    if (urlNormalizer.Normalize(UriFrom))
                    {
                        if (urlNormalizer.NormalizedUri == null) //ok
                        {
                            bool ok = false;

                            bool hostFromIsCanonical =
                                UrlManager.IsCanonicalHostName(UriFrom.Host);
                            string hostStateFrom =
                                UrlManager.GetStateCodeFromHostName(UriFrom.Host);
                            string pathFromLower =
                                UriFrom.AbsolutePath.ToLowerInvariant();
                            QueryStringCollection qscFrom =
                                QueryStringCollection.Parse(UriFrom.Query);

                            // ignore if UriFrom == UriTo
                            if (Uri.Compare(UriFrom, UriTo,
                                            UriComponents.AbsoluteUri, UriFormat.SafeUnescaped,
                                            StringComparison.OrdinalIgnoreCase) == 0)
                            {
                                ok = true;
                            }

                            // ignore http://<canonical>/default.aspx (no query)
                            if (hostFromIsCanonical &&
                                pathFromLower == "/default.aspx" &&
                                qscFrom.Count == 0)
                            {
                                ok = true;
                            }

                            //// ignore http://<canonical for state>/default.aspx?State=<state>
                            //if (hostFromIsCanonical &&
                            //  pathFromLower == "/default.aspx" &&
                            //  qscFrom.Count == 1 &&
                            //  qscFrom["State"] == hostStateFrom)
                            //  ok = true;

                            if (!ok)
                            {
                                ReportError("<ok>");
                            }
                        }
                        else
                        {
                            if (Uri.Compare(urlNormalizer.NormalizedUri, UriTo,
                                            UriComponents.AbsoluteUri, UriFormat.SafeUnescaped,
                                            StringComparison.OrdinalIgnoreCase) != 0)
                            {
                                bool ok = false;

                                bool hostFromIsCanonical =
                                    UrlManager.IsCanonicalHostName(UriFrom.Host);
                                string canonicalHostFromLower =
                                    UrlManager.GetCanonicalHostName(UriFrom.Host).ToLowerInvariant();
                                string pathFromLower =
                                    UriFrom.AbsolutePath.ToLowerInvariant();
                                string hostNewLower =
                                    urlNormalizer.NormalizedUri.Host.ToLowerInvariant();
                                string pathNewLower =
                                    urlNormalizer.NormalizedUri.AbsolutePath.ToLowerInvariant();
                                QueryStringCollection qscFrom =
                                    QueryStringCollection.Parse(UriFrom.Query);
                                QueryStringCollection qscNew =
                                    QueryStringCollection.Parse(urlNormalizer.NormalizedUri.Query);
                                string queryStateFrom = qscFrom["State"];
                                if (queryStateFrom == null || !db.Is_StateCode_State(queryStateFrom))
                                {
                                    queryStateFrom = string.Empty;
                                }
                                string stateHostFromLower =
                                    UrlManager.GetStateHostName(queryStateFrom).ToLower();

                                // ignore http://<anyhost>/default.aspx (no query) ->
                                // http://<canonical for anyhost>/
                                if (canonicalHostFromLower == hostNewLower &&
                                    pathFromLower == "/default.aspx" &&
                                    pathNewLower == "/" &&
                                    qscFrom.Count == 0 &&
                                    qscNew.Count == 0)
                                {
                                    ok = true;
                                }

                                // ignore http://<anyhost>/default.aspx?State=<state> ->
                                // http://<canonical for state>/
                                if (qscFrom.Count == 1 &&
                                    queryStateFrom != null &&
                                    stateHostFromLower == hostNewLower &&
                                    pathFromLower == "/default.aspx" &&
                                    pathNewLower == "/")
                                {
                                    ok = true;
                                }

                                // ignore http://<canonical>/default.aspx?gclid=<anything>
                                if (hostFromIsCanonical &&
                                    pathFromLower == "/default.aspx" &&
                                    qscFrom.Count == 1 &&
                                    qscFrom["gclid"] != string.Empty)
                                {
                                    ok = true;
                                }

                                if (!ok)
                                {
                                    ReportError(urlNormalizer.NormalizedUri);
                                }

                                if (!urlNormalizer.Normalize(urlNormalizer.NormalizedUri) ||
                                    urlNormalizer.NormalizedUri != null) // symmetry error
                                {
                                    ReportError("symmetry");
                                }
                            }
                        }
                    }
                    else // error
                    {
                        ReportError(urlNormalizer.ErrorMessage);
                    }
                }
                catch (Exception ex)
                {
                    ReportError(ex.ToString());
                }
            }
        }