private void NotifyDescendingSortRequested()
{
switch (_sortKey)
{
case SortKey.Price:
InternalData = InternalData.OrderBy(i => i.Data.Cost).ThenBy(i => i.Data.Name).ToList();
return;
default:
InternalData = InternalData.OrderBy(i => i.Data.Name).ToList();
return;
}
}