Opc.Ua.Server.CoreNodeManager.DeleteRegisteredSources C# (CSharp) Method

        private void DeleteRegisteredSources(ILocalNode existingNode)
        {
            // remove existing external source.
            IEventSource eventSource = null;

            SourceHandle handle = existingNode.Handle as SourceHandle;

            if (handle != null)
            {
                eventSource = handle.Source as IEventSource;

                if (eventSource != null)
                {
                    m_eventSources.Remove(handle.Source);
                }
            }
            
            // check if the node is a source itself.
            eventSource = existingNode as IEventSource;

            if (eventSource != null)
            {
                m_eventSources.Remove(existingNode);
            }
        }