Question about Half-Edge Structure

HI Guys, 

I have recently started to try and implement plankton in some custom c# components and I have some problems with getting the edge pointers to work properly. SO the question is am I correct in understanding that the following code should give me the index's for the vertices that make up an edge in my mesh?

A = plm.Halfedges.EndVertex(y);
B = plm.Halfedges.EndVertex(plm.Halfedges[y].NextHalfedge);

See attached image for what I am getting. 

I was wondering if I would have to call a sort command off sorts? or that my assumptions are wrong. 

Any help is more then welcome. 

- Jens