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using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace InvoiceTotal
{
public partial class frmInvoiceTotal : Form
{
public frmInvoiceTotal()
{
InitializeComponent();
}
// DONE: declare class variables for array and list here
decimal[] rayInvoices = new decimal[5];
int invoice = 0;
List<decimal> listInvoices = new List<decimal>(5);
private void btnCalculate_Click(object sender, EventArgs e)
{
try {
if (txtSubtotal.Text == "") {
MessageBox.Show(
"Subtotal is a required field.", "Entry Error");
}
else {
decimal subtotal = Decimal.Parse(txtSubtotal.Text);
if (subtotal > 0 && subtotal < 10000) {
decimal discountPercent = 0m;
if (subtotal >= 500)
discountPercent = .2m;
else if (subtotal >= 250 & subtotal < 500)
discountPercent = .15m;
else if (subtotal >= 100 & subtotal < 250)
discountPercent = .1m;
decimal discountAmount = subtotal * discountPercent;
decimal invoiceTotal = subtotal - discountAmount;
discountAmount = Math.Round(discountAmount, 2);
invoiceTotal = Math.Round(invoiceTotal, 2);
rayInvoices[invoice] = invoiceTotal;
invoice++;
listInvoices.Add(invoiceTotal);
txtDiscountPercent.Text = discountPercent.ToString("p1");
txtDiscountAmount.Text = discountAmount.ToString();
txtTotal.Text = invoiceTotal.ToString();
}
else {
MessageBox.Show(
"Subtotal must be greater than 0 and less than 10,000.",
"Entry Error");
}
}
}
catch (FormatException) {
MessageBox.Show(
"Please enter a valid number for the Subtotal field.",
"Entry Error");
}
catch (IndexOutOfRangeException) {
MessageBox.Show(
"You have already reached the maximum amount of invoices",
"Out of Range Error");
}
txtSubtotal.Focus();
}
private void btnExit_Click(object sender, EventArgs e)
{
// DONE: add code that displays dialog boxes here
if (invoice > 0) {
string msg = "";
Array.Sort(rayInvoices);
foreach (decimal i in rayInvoices)
if (i != 0)
msg += i.ToString("c") + "\n";
MessageBox.Show(msg, "Order Totals - Array");
msg = "";
listInvoices.Sort();
foreach (decimal i in listInvoices)
if (i != 0)
msg += i.ToString("c") + "\n";
MessageBox.Show(msg, "Order Totals - List");
}
this.Close();
}
}
}
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