Node thisNode = new Node();
            thisNode.Id = 12412;
            var r = new WeakReference(thisNode);
            thisNode = null;
            var currentLineNumber = 42;
            string typeName = (thisNode != null) ? thisNode.GetType().ToString() : "undefined";
            Debug.WriteLine("# '" + currentLineNumber + "' thisNode '" + r.Target + "' typeName '" + typeName + "'");