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private void insertItem(T item, ref Node<T> tree)
        {
            if (tree == null)
                tree = new Node<T>(item);
            else if (item.CompareTo(tree.Data) < 0) 
                insertItem(item, ref tree.Left);
            else if (item.CompareTo(tree.Data) > 0)
                insertItem(item, ref tree.Right);
            tree.BalanceFactor = Height(tree.Left) - Height(tree.Right);
            if (tree.BalanceFactor <= -2)
                rotateLeft(ref tree);
            if (tree.BalanceFactor >= 2)
                rotateRight(ref tree);
        }