/// <summary>
/// This is the overloaded view model constructor.
/// It takes the customer selected and the previous view model to repopulate some of the variables in this new instance.
/// </summary>
public AddViewModel(Customer _customer, AddViewModel prevVM)
{
items = prevVM.items;
transactionOverview = prevVM.transactionOverview;
transactionOverview.Customer = _customer;
transactionOverview.CustomerId = _customer.CustomerId;
}
/// <summary>
/// This is the overloaded view model constructor.
/// It takes the item to be added and the previous view model to repopulate some of the variables in this new instance.
/// </summary>
public AddViewModel(Item _item, AddViewModel prevVM)
{
items = prevVM.items;
items.Add(_item);
transactionOverview = prevVM.transactionOverview;
transactionOverview.TotalValue += _item.ItemPrice;
}