public void Delete(InvoiceItem onInvoice)
{
_db.InvoiceItems.Remove(onInvoice);
_db.SaveChanges();
}
public void Update(int id, InvoiceItem onInvoice)
{
_db.Entry(onInvoice).State = EntityState.Modified;
_db.SaveChanges();
}
public void Add(InvoiceItem onInvoice)
{
_db.InvoiceItems.Add(onInvoice);
_db.SaveChanges();
}