protected void SendButton_Click(object sender, EventArgs e)
        {
            if (Page.IsValid)
            {
                Receipt receipt = new Receipt(new double());
                receipt.Calculate(double.Parse(InputBox.Text));

                Total.Text = String.Format("{0:c}",receipt.Subtotal);
                Rabattsats.Text = String.Format("{0}%",receipt.DiscountRate);
                Rabatt.Text = String.Format("{0:c}", receipt.MoneyOff);
                Pay.Text = String.Format("{0:c}", receipt.Total);
                Kvitto.Visible = true;
            }
        }
 protected void CalcDiscount_Click(object sender, EventArgs e)
 {
     if (IsValid)
     {
         double theSum;
         if (double.TryParse(InputField.Text, out theSum)) // lika bra att va extra säker med tryparse
         {
             Receipt rec = new Receipt(theSum);
             rec.Calculate(theSum);
             DrawReceipt(rec);
         }
         else
         {
             ErrorText.Text = "Error! Något blev fel vid parsningen";
         }
     }
 }
        protected void DrawReceipt(Receipt rec)
        {
            ReceiptH1.Text = "Ica Supermarket<br />";
            ReceiptHeader.Text = "Din lokala mataffär!<br /><br />";
            ReceiptHeader.Text += "Tel: 0772-90-00-00<br />";
            ReceiptHeader.Text += "Öppettider 8-17<br />";
            ReceiptHeader.Text += "MÅNDAGAR - FREDAGAR<br />";
            ReceiptBody1.Text = "Totalt:";
            ReceiptBody2.Text = String.Format("{0:c}<br />", rec.SubTotal);
            ReceiptBody3.Text = "Rabattsats:";
            ReceiptBody4.Text = rec.DiscountRate + "%<br />";
            ReceiptBody5.Text = "Rabatt:";
            ReceiptBody6.Text = String.Format("{0:c}<br />", rec.MoneyOff);
            ReceiptBody7.Text = "Att betala:";
            ReceiptBody8.Text = String.Format("{0:c}<br />", rec.Total);
            ReceiptFooter.Text = "Org nr 2053 33 53<br />";
            ReceiptFooter.Text += "VÄLKOMMEN ÅTER!";

            if (receiptBox.CssClass == "HideThis")
            {
                receiptBox.CssClass = "ShowThis";
            }
        }