public Order(SP_Get_ItemListResult itemResult)
{
DBDataContext dbContext = new DBDataContext();
orderItemID = itemResult.orderItemID;
itemName = itemResult.ItemName;
quantity = itemResult.quantity;
// other properties ...
var additionals = dbContext.SP_Get_AdditionalsList(orderItemID);
Additionals = new ObservableCollection <string>();
foreach (var item in additionals)
{
Additionals.Add(item.Additionals);
}
}