1 files changed, 59 insertions, 0 deletions
diff --git a/invoice_total3/InvoiceTotal/frmInvoiceTotal.cs b/invoice_total3/InvoiceTotal/frmInvoiceTotal.cs
new file mode 100644
index 0000000..94edf91
--- /dev/null
+++ b/invoice_total3/InvoiceTotal/frmInvoiceTotal.cs
@@ -0,0 +1,59 @@
+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();
+		}
+	}
+}
\ No newline at end of file