public IEnumerable <LinePointsGroup <Sale> > LinePointGroups()
{
var retrievers = new PointGroup <Sale>("Retrievers");
retrievers.Add(new Sale("\"Golden\";\"2.000,00\";4;\"2018-01-01\""));
retrievers.Add(new Sale("\"Golden\";\"5.000,00\";2;\"2018-01-01\""));
retrievers.Add(new Sale("\"Golden\";\"2.000,00\";6;\"2018-01-01\""));
yield return(new LinePointsGroup <Sale>(
new List <PointGroup <Sale> >
{
retrievers
},
"Puppies"
));
}
