public static bool operator ==(Node<T> lhs, Node<T> rhs)
    {
        if ((lhs == null) || (rhs == null))
        {
            return false;
        }

        if((lhs.Data).CompareTo(rhs.Data) == 0)
        {
            return true;
        }
        else
        {
            return false;
        }
    }

if ((lhs == null) || (rhs == null))