agung Nim : 13150769 kelas : 13.6A.37

1. BILLING

using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Linq;using System.Text;using System.Windows.Forms;using System.Diagnostics;namespace Billing_Application {public partial class Form1 : Form{private Stopwatch wkt = null;public Form1() { InitializeComponent(); }private void button1_Click(object sender, EventArgs e) {if (textBox1.Text != "") { wkt = new Stopwatch();if (button1.Text == "Log In") { label2.Visible = true; wkt.Start(); button1.Text = "Stop"; }else if (button1.Text == "Stop") { wkt.Stop();if (wkt.Elapsed.TotalMinutes <= 30.00) {MessageBox.Show("Jumlah tagihan anda sebesar Rp.1000", "Total Tagihan"); }else if (wkt.Elapsed.TotalHours <= 1.00) {MessageBox.Show("Jumlah Tagihan anda sebesar Rp.2000", "Total Tagihan"); } wkt.Reset(); label2.Visible = false; button1.Text = "Log In"; textBox1.Text = null; }

}else if (textBox1.Text =="") {MessageBox.Show("Nama Harus diisi! ", "Important Message"); } }private void timer1_Tick(object sender, EventArgs e) {if (wkt != null) { label2.Text = wkt.Elapsed.ToString(@"hh\:mm\:ss"); } } } }