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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();
}
private void btnCalculate_Click(object sender, EventArgs e)
{
try {
if (txtSubtotal.Text == "") {
MessageBox.Show("Please enter a subtotal",
"Entry Error");
return;
}
decimal subtotal = Decimal.Parse(txtSubtotal.Text);
if (subtotal <= 0 || subtotal >= 10000) {
MessageBox.Show("The subtotal must be in the "
+ "range of 1 to 9999", "Entry Error");
return;
}
decimal discountPercent = .25m;
decimal discountAmount = subtotal * discountPercent;
decimal invoiceTotal = subtotal - discountAmount;
discountAmount = Math.Round(discountAmount, 2);
invoiceTotal = Math.Round(invoiceTotal, 2);
txtDiscountPercent.Text = discountPercent.ToString("p1");
txtDiscountAmount.Text = discountAmount.ToString();
txtTotal.Text = invoiceTotal.ToString();
txtSubtotal.Focus();
}
catch {
MessageBox.Show(
"Please enter a valid subtotal for the "
+ "subtotal field.", "Entry Error");
}
}
private void btnExit_Click(object sender, EventArgs e)
{
this.Close();
}
}
}
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