private void PaymentScreen_Load(object sender, EventArgs e)
        {
            SardirimRest_DBEntities db = new SardirimRest_DBEntities();

            IQueryable <Order> orders = db.Orders.Where(x => x.PaymentStatusID == 1 && x.PaymentStatusID != 3);


            foreach (var order in orders)
            {
                ListViewItem lst = new ListViewItem();
                lst.Text = order.OrderID.ToString();
                lst.SubItems.Add(order.Table.TableName);
                lst.SubItems.Add(order.Customer.CustomerName);
                if (order.PaymentStatusID == 1)
                {
                    lst.SubItems.Add("Ödenmedi");
                }
                lst.SubItems.Add(order.Bills.Sum(x => x.BillAmount).ToString());
                lstPaymenStatus.Items.Add(lst);
            }
        }