C#/SP: add/remove list event receiver

        private const string ReqListName = "Requests";

        // Uncomment the method below to handle the event raised after a feature has been activated.
        public override void FeatureActivated(SPFeatureReceiverProperties properties)
        {
            addListEventReceivers(properties, ReqListName, typeof(RequestEventReceiver), SPEventReceiverType.ItemAdded);
        }

        // Uncomment the method below to handle the event raised before a feature is deactivated.
        public override void FeatureDeactivating(SPFeatureReceiverProperties properties)
        {
            removeListEventReceivers(properties, ReqListName, typeof(RequestEventReceiver), SPEventReceiverType.ItemAdded);
        }


        private void addListEventReceivers(SPFeatureReceiverProperties properties, string listName, Type eventReceiverClassType, SPEventReceiverType eventReceiverType)
        {
            try
            {
                SPWeb w = properties.Feature.Parent as SPWeb;
                if (w != null)
                {
                    SPList l = w.Lists.TryGetList(listName);
                    if (l != null)
                    {
                        l.EventReceivers.Add(eventReceiverType, eventReceiverClassType.Assembly.FullName, eventReceiverClassType.FullName);
                    }
                }
            }
            catch (Exception ex)
            {
                CustomSpLoggingService.Current.LogException(CustomSpLoggingService.DiagnosticCategory.FeatureActivation, ex);
                throw;
            }
        }


        private void removeListEventReceivers(SPFeatureReceiverProperties properties, string listName, Type eventReceiverClassType, SPEventReceiverType eventReceiverType)
        {
            try
            {
                SPWeb w = properties.Feature.Parent as SPWeb;
                if (w != null)
                {
                    SPList l = w.Lists.TryGetList(listName);
                    if (l != null)
                    {
                        if (l.EventReceivers != null && l.EventReceivers.Count > 0)
                        {
                            SPEventReceiverDefinition er = l.EventReceivers.Cast<SPEventReceiverDefinition>().SingleOrDefault(
                                x => x.Assembly == eventReceiverClassType.Assembly.FullName &&
                                        x.Class == eventReceiverClassType.FullName &&
                                        x.Type == eventReceiverType);
                            if (er != null)
                            {
                                er.Delete();
                            }
                        }
                    }
                }
            }
            catch (Exception ex)
            {
                CustomSpLoggingService.Current.LogException(CustomSpLoggingService.DiagnosticCategory.FeatureActivation, ex);
                throw;
            }
        }