public TopologyRule TopologyRule {get; set;}

{
  static void MarkAndUnmarkAsErrors(ArcGIS.Core.Data.Topology.Topology topology)
  {
    // Get all the errors due to features violating the "PointProperlyInsideArea" topology rule.
    using (TopologyDefinition topologyDefinition = topology.GetDefinition())
    {
      TopologyRule pointProperlyInsideAreaRule = topologyDefinition.GetRules().First(rule => rule.RuleType == TopologyRuleType.PointProperlyInsideArea);

      ErrorDescription errorDescription = new ErrorDescription(topology.GetExtent())
      {
        TopologyRule = pointProperlyInsideAreaRule
      };

      IReadOnlyList<TopologyError> errorsDueToViolatingPointProperlyInsideAreaRule = topology.GetErrors(errorDescription);
      Console.WriteLine($"There are {errorsDueToViolatingPointProperlyInsideAreaRule.Count} feature violating the 'PointProperlyInsideArea' topology rule.");

      // Mark all errors from features violating the 'PointProperlyInsideArea' topology rule as exceptions.
      foreach (TopologyError error in errorsDueToViolatingPointProperlyInsideAreaRule)
      {
        topology.MarkAsException(error);
      }

      // Now verify all the errors from features violating the 'PointProperlyInsideArea' topology rule have indeed been
      // marked as exceptions.
      //
      // By default, ErrorDescription is initialized to ErrorType.ErrorAndException.  Here we want ErrorType.ErrorOnly.
      errorDescription = new ErrorDescription(topology.GetExtent())
      {
        ErrorType = ErrorType.ErrorOnly,
        TopologyRule = pointProperlyInsideAreaRule
      };

      IReadOnlyList<TopologyError> errorsAfterMarkedAsExceptions = topology.GetErrors(errorDescription);
      Console.WriteLine($"There are {errorsAfterMarkedAsExceptions.Count} feature violating the 'PointProperlyInsideArea' topology rule after all the errors have been marked as exceptions.");

      // Finally, reset all the exceptions as errors by unmarking them as exceptions.

      foreach (TopologyError error in errorsDueToViolatingPointProperlyInsideAreaRule)
      {
        topology.UnmarkAsException(error);
      }

      IReadOnlyList<TopologyError> errorsAfterUnmarkedAsExceptions = topology.GetErrors(errorDescription);
      Console.WriteLine($"There are {errorsAfterUnmarkedAsExceptions.Count} feature violating the 'PointProperlyInsideArea' topology rule after all the exceptions have been reset as errors.");
    }
  }
}