Code

  float posY = diagramView.Bounds.Height/2 ;
  float pos = 0;
  RectangleF bound = new RectangleF(pos, posY, 30, 20);
  ShapeNode baseNode = diagram.Factory.CreateShapeNode(bound);
  baseNode.Shape = Shapes.Ellipse;

  pos++;
foreach (DataRow dr in dtRelContacts.Rows)
            {
                ShapeNode node;


    node = diagram.Factory.CreateShapeNode(bound);


node.Bounds = new RectangleF(20 + pos * 40, posY, 30, 20);


    pos++;



}

diagramView.ZoomToFit();