public void RemoveItem(InvoiceItem invoiceItem) { this.InvoiceList.RemoveAt(this.InvoiceList.IndexOf(invoiceItem)); }
public void GetItem(InvoiceItem invoiceItem) { this.InvoiceList.IndexOf(invoiceItem); }
public void AddItem(InvoiceItem invoiceItem) { this.InvoiceList.Add(invoiceItem); }