protected void ButtonDeleteDistricts_OnClick(object sender, EventArgs e)
        {
            switch (DeleteDistrictsReloading.Value)
            {
            case "reloading":
            {
                DeleteDistrictOverride.AddCssClasses("hidden");
                ControlDeleteDistrictOverride.Checked = false;
                _DeleteDistrictsTabInfo.ClearValidationErrors();
                DeleteDistrictsReloading.Value = Empty;
                PopulateLocalDistrictDropdown();
                _DeleteDistrictsTabInfo.LoadControls();
                FeedbackDeleteDistricts.AddInfo("Delete Districts information loaded.");
            }
            break;

            case "":
            {
                // normal update
                DeleteDistrictOverride.AddCssClasses("hidden");
                _DeleteDistrictsTabInfo.ClearValidationErrors();
                var localKey      = ControlDeleteDistrictsLocalKey.GetValue();
                var localDistrict = LocalDistricts.GetLocalDistrictByStateCodeLocalKey(StateCode,
                                                                                       localKey);

                var referenceList = new List <string>();
                if (!ControlDeleteDistrictOverride.Checked)
                {
                    // check for references in other counties
                    var otherCounties = new List <string>();
                    foreach (var oc in
                             LocalIdsCodes.GetOtherCountyReferences(StateCode, CountyCode, localKey)
                             .Rows.OfType <DataRow>())
                    {
                        otherCounties.Add(oc.County());
                    }

                    // check for meaningful usages
                    FormatReferences(referenceList, "Elections",
                                     Elections.CountByStateCodeLocalKey(StateCode, localKey));
                    FormatReferences(referenceList, "ElectionsOffices",
                                     ElectionsOffices.CountByStateCodeLocalKey(StateCode, localKey));
                    FormatReferences(referenceList, "ElectionsPoliticians",
                                     ElectionsPoliticians.CountByStateCodeLocalKey(StateCode, localKey));
                    FormatReferences(referenceList, "QuestionsJurisdictions",
                                     QuestionsJurisdictions.CountByIssueLevelStateCodeCountyOrLocal(
                                         Issues.IssueLevelLocal, StateCode, localKey));
                    FormatReferences(referenceList, "Offices",
                                     Offices.CountByStateCodeLocalKey(StateCode, localKey));
                    FormatReferences(referenceList, "OfficesOfficials",
                                     OfficesOfficials.CountByStateCodeLocalKey(StateCode, localKey));
                    FormatReferences(referenceList, "Referendums",
                                     Referendums.CountByStateCodeLocalKey(StateCode, localKey));

                    if (referenceList.Count > 0 || otherCounties.Count > 0)
                    {
                        DeleteDistrictOverride.RemoveCssClass("hidden");
                        if (otherCounties.Count > 0)
                        {
                            FeedbackDeleteDistricts.PostValidationError(ControlDeleteDistrictsLocalKey,
                                                                        "The district is referenced in the following other counties. If you delete this" +
                                                                        " district it will be removed from the other counties also. Check the box to" +
                                                                        " override.");
                            foreach (var oc in otherCounties)
                            {
                                FeedbackDeleteDistricts.AddError(oc);
                            }
                        }
                        if (referenceList.Count > 0)
                        {
                            FeedbackDeleteDistricts.PostValidationError(ControlDeleteDistrictsLocalKey,
                                                                        "Cannot delete because the LocalKey is referenced in the following tables. Check the box to override.");
                            foreach (var @ref in referenceList)
                            {
                                FeedbackDeleteDistricts.AddError(@ref);
                            }
                        }
                        return;
                    }
                }

                // delete
                ControlDeleteDistrictOverride.Checked = false;
                DeleteAllDistictReferences(StateCode, localKey);
                LocalDistricts.DeleteByStateCodeLocalKey(StateCode, localKey);

                // delete TigerPlacesCounties rows if type Vote -- these are not intrinsically tied
                // to county(s)
                var localIdsCodes = LocalIdsCodes.GetDataByStateCodeLocalKey(StateCode, localKey);
                Debug.Assert(localIdsCodes.Count == 1);
                if (localIdsCodes[0].LocalType == LocalIdsCodes.LocalTypeVote)
                {
                    TigerPlacesCounties.DeleteByStateCodeTigerTypeTigerCode(StateCode,
                                                                            LocalIdsCodes.LocalTypeVote, localIdsCodes[0].LocalId);
                }
                LocalIdsCodes.DeleteByStateCodeLocalKey(StateCode, localKey);
                _DeleteDistrictsTabInfo.ClearValidationErrors();
                PopulateLocalDistrictDropdown();
                _DeleteDistrictsTabInfo.LoadControls();
                NavigateJurisdictionUpdatePanel.Update();
                NavigateJurisdiction.Initialize();

                FeedbackDeleteDistricts.AddInfo(
                    $"Local District {localDistrict} ({localKey}) deleted.");
            }
            break;

            default:
                throw new VoteException(
                          $"Unknown reloading option: '{DeleteDistrictsReloading.Value}'");
            }
        }