ienumerable - C# Why cannot I write custom IEnumerator for my class -

I have a simple class that represents vertex in a graph that is likely to have a tree. Thus, this class looks like this:

  class versatx {public versatile origin; Public list & lieutenant; Vertex & gt; children; }   
 If there is no possibility of loops, I can add only one head as a hair multiple times.  
 Now, I have made a calculator that graphs every head. So that you can  
  foreach (root vertex in the vertex item)   
 and get every head in the graph. For this, I had to make my class INMEMERABLE {VERTEX} and write the gate anemeter method which grows all the vertextures in a continuous form.  
 Now, for the purposes of graphging, I want another enumerator, which will return to every edge of the graph, then I can do something like this  
  foreach (Point [] Item in rootvertex.GetEdges ())   
 and get all the edges. For this purpose, to avoid confusion, I removed IEnumerable from my classroom and thus implemented two methods  
  Public Inimatorator & lt; Vertex & gt; GetVertexes () {... code ...} public IEnumerator & lt; Point [] & gt; GetEdges () {... code ...}   
 However, when I try to  
  foreach (point [] root roottex Items in etetges] ())   
 This error spits - foreach can not be calculated on the root vertex because the GetEnumerator method is not included in the vertex class.  
 I tried googling but the weather was not found or not I can not make or make multiple calculators in the same class. First and foremost, you do not have  IEnumerable  not  IEnumerator   
 
 as the return result:  
  public IEnumerable & lt; Point [] & gt; GetEdges () {... code ...}