ArcGIS4LocalGovernment.AttributeAssistantEditorExtension.OnShutdown C# (CSharp) Метод

        protected override void OnShutdown()
        {
            try
            {
                script = null;
                lastValue = null;

                intersectLayer = null;

                intersectTable = null;
                intersectLayerSelection = null;
                intersectTableSelection = null;
                qFilter = null;
                row = null;
                testField = null;

                curve = null;
                sourceLayer = null;
                pFS = null;

                _copyPoint = null;
                _copyPolyline = null;
                _copyPolygon = null;
                sFilter = null;
                try
                {
                    if (fCursor != null)
                        Marshal.ReleaseComObject(fCursor);
                    if (cCurs != null)
                        Marshal.ReleaseComObject(cCurs);
                    if (sourceFeature != null)
                        Marshal.ReleaseComObject(sourceFeature);

                }
                catch
                { }
                fCursor = null;
                cCurs = null;

                sourceFeature = null;
                nearestFeature = null;
                fieldObj = null;
                _currentDataset = null;
                proxOp = null;

            }
            catch { }
            try
            {
                if (AAState._sw != null)
                {
                    AAState._sw.Flush();
                    AAState._sw.Close();
                    AAState._sw = null;
                }

            }
            catch { }
            try
            {
                if (ArcMap.Events != null)
                {
                    ArcMap.Events.NewDocument -= ArcMap_NewOpenDocument;
                    ArcMap.Events.OpenDocument -= ArcMap_NewOpenDocument;
                }
                if (AAState._editor != null)
                {

                    if (AAState._editor != null)
                    {

                        //Wire editor events.
                        AAState._editEvents = (IEditEvents_Event)AAState._editor;
                        AAState._editEvents.OnStartEditing -= OnStartEditing;
                        AAState._editEvents.OnStopEditing -= OnStopEditing;
                        AAState._editEvents2 = (IEditEvents2_Event)AAState._editor;// SG Jan 2003

                        AAState._editor = null;
                        AAState._editEvents = null;
                        AAState._editEvents2 = null;  // SG Jan 2003

                    }
                }

                try
                {
                    AAState.bmpOff.Dispose();
                    AAState.bmpOn.Dispose();
                    AAState.commandItem = null;
                }
                catch { }
            }

            catch (Exception ex)
            {
                MessageBox.Show(A4LGSharedFunctions.Localizer.GetString("AttributeAssistantEditorChain5") + ex.Message);

            }
        }