public void Execute(ESRI.ArcGIS.esriSystem.IArray paramvalues, ESRI.ArcGIS.esriSystem.ITrackCancel TrackCancel, ESRI.ArcGIS.Geoprocessing.IGPEnvironmentManager envMgr, ESRI.ArcGIS.Geodatabase.IGPMessages message)
        {
            try
            {
                IGPUtilities3 gpUtilities3 = new GPUtilitiesClass() as IGPUtilities3;

                if (TrackCancel == null)
                {
                    TrackCancel = new CancelTrackerClass();
                }

                // decode in the input layers
                IGPParameter in_SourceFeatureClassParameter = paramvalues.get_Element(in_sourceFeatureClassNumber) as IGPParameter;
                IGPValue     in_SourceFeatureGPValue        = gpUtilities3.UnpackGPValue(in_SourceFeatureClassParameter) as IGPValue;

                IFeatureClass sourceFeatureClass = null;
                IQueryFilter  queryFilter        = null;

                gpUtilities3.DecodeFeatureLayer((IGPValue)in_SourceFeatureGPValue, out sourceFeatureClass, out queryFilter);

                if (sourceFeatureClass == null)
                {
                    message.AddError(120027, resourceManager.GetString("GPTools_OSMGPFeatureComparison_source_nullpointer"));
                    return;
                }

                IGPParameter in_NumberOfIntersectionsFieldParameter = paramvalues.get_Element(in_sourceIntersectionFieldNumber) as IGPParameter;
                IGPValue     in_NumberOfIntersectionsFieldGPValue   = gpUtilities3.UnpackGPValue(in_NumberOfIntersectionsFieldParameter) as IGPValue;

                IGPParameter in_SourceRefIDFieldParameter = paramvalues.get_Element(in_sourceRefIDsFieldNumber) as IGPParameter;
                IGPValue     in_SourceRefIDFieldGPValue   = gpUtilities3.UnpackGPValue(in_SourceRefIDFieldParameter) as IGPValue;

                IGPParameter in_MatchFeatureClassParameter = paramvalues.get_Element(in_MatchFeatureClassNumber) as IGPParameter;
                IGPValue     in_MatchFeatureGPValue        = gpUtilities3.UnpackGPValue(in_MatchFeatureClassParameter) as IGPValue;

                IFeatureClass matchFeatureClass = null;
                IQueryFilter  matchQueryFilter  = null;

                gpUtilities3.DecodeFeatureLayer((IGPValue)in_MatchFeatureGPValue, out matchFeatureClass, out matchQueryFilter);


                if (matchFeatureClass == null)
                {
                    message.AddError(120028, resourceManager.GetString("GPTools_OSMGPFeatureComparison_match_nullpointer"));
                    return;
                }

                if (queryFilter != null)
                {
                    if (((IGeoDataset)matchFeatureClass).SpatialReference != null)
                    {
                        queryFilter.set_OutputSpatialReference(sourceFeatureClass.ShapeFieldName, ((IGeoDataset)matchFeatureClass).SpatialReference);
                    }
                }


                IWorkspace     sourceWorkspace     = ((IDataset)sourceFeatureClass).Workspace;
                IWorkspaceEdit sourceWorkspaceEdit = sourceWorkspace as IWorkspaceEdit;

                if (sourceWorkspace.Type == esriWorkspaceType.esriRemoteDatabaseWorkspace)
                {
                    sourceWorkspaceEdit = sourceWorkspace as IWorkspaceEdit;
                    sourceWorkspaceEdit.StartEditing(false);
                    sourceWorkspaceEdit.StartEditOperation();
                }

                // get an overall feature count as that determines the progress indicator
                int featureCount = ((ITable)sourceFeatureClass).RowCount(queryFilter);

                // set up the progress indicator
                IStepProgressor stepProgressor = TrackCancel as IStepProgressor;

                if (stepProgressor != null)
                {
                    stepProgressor.MinRange  = 0;
                    stepProgressor.MaxRange  = featureCount;
                    stepProgressor.Position  = 0;
                    stepProgressor.Message   = resourceManager.GetString("GPTools_OSMGPFeatureComparison_progressMessage");
                    stepProgressor.StepValue = 1;
                    stepProgressor.Show();
                }

                int numberOfIntersectionsFieldIndex = sourceFeatureClass.FindField(in_NumberOfIntersectionsFieldGPValue.GetAsText());
                int sourceRefIDFieldIndex           = sourceFeatureClass.FindField(in_SourceRefIDFieldGPValue.GetAsText());

                ISpatialFilter matchFCSpatialFilter = new SpatialFilter();
                matchFCSpatialFilter.GeometryField = matchFeatureClass.ShapeFieldName;
                matchFCSpatialFilter.SpatialRel    = esriSpatialRelEnum.esriSpatialRelIntersects;
                matchFCSpatialFilter.WhereClause   = matchQueryFilter.WhereClause;

                using (ComReleaser comReleaser = new ComReleaser())
                {
                    IFeatureCursor sourceFeatureCursor = sourceFeatureClass.Search(queryFilter, false);
                    comReleaser.ManageLifetime(sourceFeatureCursor);

                    IFeature sourceFeature = null;

                    while ((sourceFeature = sourceFeatureCursor.NextFeature()) != null)
                    {
                        int    numberOfIntersections = 0;
                        string intersectedFeatures   = String.Empty;

                        IPolyline sourceLine = sourceFeature.Shape as IPolyline;

                        matchFCSpatialFilter.Geometry = sourceLine;

                        using (ComReleaser innerReleaser = new ComReleaser())
                        {
                            IFeatureCursor matchFeatureCursor = matchFeatureClass.Search(matchFCSpatialFilter, false);
                            innerReleaser.ManageLifetime(matchFeatureCursor);

                            IFeature matchFeature = null;

                            while ((matchFeature = matchFeatureCursor.NextFeature()) != null)
                            {
                                IPointCollection intersectionPointCollection = null;
                                try
                                {
                                    ITopologicalOperator topoOperator = sourceLine as ITopologicalOperator;

                                    if (topoOperator.IsSimple == false)
                                    {
                                        ((ITopologicalOperator2)topoOperator).IsKnownSimple_2 = false;
                                        topoOperator.Simplify();
                                    }

                                    IPolyline matchPolyline = matchFeature.Shape as IPolyline;

                                    if (queryFilter != null)
                                    {
                                        matchPolyline.Project(sourceLine.SpatialReference);
                                    }

                                    if (((ITopologicalOperator)matchPolyline).IsSimple == false)
                                    {
                                        ((ITopologicalOperator2)matchPolyline).IsKnownSimple_2 = false;
                                        ((ITopologicalOperator)matchPolyline).Simplify();
                                    }

                                    intersectionPointCollection = topoOperator.Intersect(matchPolyline, esriGeometryDimension.esriGeometry0Dimension) as IPointCollection;
                                }
                                catch (Exception ex)
                                {
                                    message.AddWarning(ex.Message);
                                    continue;
                                }

                                if (intersectionPointCollection != null && intersectionPointCollection.PointCount > 0)
                                {
                                    numberOfIntersections = numberOfIntersections + intersectionPointCollection.PointCount;

                                    if (String.IsNullOrEmpty(intersectedFeatures))
                                    {
                                        intersectedFeatures = matchFeature.OID.ToString();
                                    }
                                    else
                                    {
                                        intersectedFeatures = intersectedFeatures + "," + matchFeature.OID.ToString();
                                    }
                                }
                            }

                            if (numberOfIntersectionsFieldIndex > -1)
                            {
                                sourceFeature.set_Value(numberOfIntersectionsFieldIndex, numberOfIntersections);
                            }

                            if (sourceRefIDFieldIndex > -1)
                            {
                                if (intersectedFeatures.Length > sourceFeatureClass.Fields.get_Field(sourceRefIDFieldIndex).Length)
                                {
                                    sourceFeature.set_Value(sourceRefIDFieldIndex, intersectedFeatures.Substring(0, sourceFeatureClass.Fields.get_Field(sourceRefIDFieldIndex).Length));
                                }
                                else
                                {
                                    sourceFeature.set_Value(sourceRefIDFieldIndex, intersectedFeatures);
                                }
                            }
                        }

                        try
                        {
                            sourceFeature.Store();
                        }
                        catch (Exception ex)
                        {
                            message.AddWarning(ex.Message);
                        }

                        if (stepProgressor != null)
                        {
                            // update the progress UI
                            stepProgressor.Step();
                        }

                        // check for user cancellation
                        if (TrackCancel.Continue() == false)
                        {
                            return;
                        }
                    }
                }

                if (sourceWorkspaceEdit != null)
                {
                    sourceWorkspaceEdit.StopEditOperation();
                    sourceWorkspaceEdit.StopEditing(true);
                }

                if (stepProgressor != null)
                {
                    stepProgressor.Hide();
                }
            }
            catch (Exception ex)
            {
                message.AddAbort(ex.Message);
            }
        }