protected override string GetCurrentValue() =>
     ThisControl.Mode == DataMode.ManageCandidates
 ? ElectionsPoliticians.GetIsIncumbentByElectionKeyOfficeKeyPoliticianKey(
         ThisControl.SafeGetElectionKey(), ThisControl.SafeGetOfficeKey(),
         ThisControl.GetPoliticianKeyToEdit(), false)
     .ToString()
 : string.Empty;