Tree concept not working with c# iterators

I’m learning c# iterators and I’m trying to make them work in this kind of tree like structure but unfortunately all I can get is to enumerate the root and their direct children.

public class Node : IEnumerable<Node>
{
  private Node Parent = null;
  private List<Node> Children = new List<Node>();
  public string Name { get; private set; };
  
  public Node(string name)
  {
    Name = name;
  }
  public Node AddChild(Node child)
  {
    Children.Add(child);
    child.Parent = this;
    return child;
  }
  
  public IEnumerator<Node> GetEnumerator()
  {
    yield return this;
    foreach (var x in Children)
      yield return x;
  }

  IEnumerator IEnumerable.GetEnumerator()
  {
    return GetEnumerator();
  }
}

I’ve tried to go recursive with a static method but IEnumerator doesn’t allow it as it has to return T. Could anyone what’s wrong with this approach? Thanks in advance.

Usage example:

Node root = new Node("html");
root.AddChild(new Node("body")).AddChild(new Node("i")).AddChild(new Node("b"));

foreach(var m in root)
  Console.WriteLine(m.Name);

>Solution :

you have one foreach missing

public IEnumerator<Node> GetEnumerator()
  {
    yield return this; // returns current item
    foreach (var x in Children) // iterates over children list
         foreach (var c in x) // iterates over child enumerator 
             yield return c; // returns child and grandchildren
  }