How to delete SharePoint event receivers on feature deactivating method.

public override void FeatureDeactivating(SPFeatureReceiverProperties properties)

        {

            SPWeb web = properties.Feature.Parent as SPWeb;

            try

            {

             SPList list = web.Lists.TryGetList("List name"); 

               if (list != null)

                 {

                  SPEventReceiverDefinition receiverDefinition = null; 

                  for (int i = list.EventReceivers.Count - 1; i >= 0; i--)

                            {

                                receiverDefinition = list.EventReceivers[i];

 

                                receiverDefinition.Delete();

                            }

                        }

            }

            catch (Exception ex)

            {

                PortalLog.LogString("Exception - {0}  -- {1} -- {2}", "XXXXXX", ex.Message, ex.StackTrace);

            }

        }