public void SwapNodes(int k)
{
if (Level % k == 0)
{
Node aux = RightNode;
RightNode = LeftNode;
LeftNode = aux;
}
if (LeftNode != null)
{
LeftNode.SwapNodes(k);
}
if (RightNode != null)
{
RightNode.SwapNodes(k);
}
}
