anulak5421414089: การบ้านครั้งที่ 8

โปรแกรมที่ 12.4

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;

namespace program12_4
{
    public partial class dipplay : Form
    {
        public dipplay()
        {
            InitializeComponent();
        }

        private void listBox1_SelectedIndexChanged(object sender, EventArgs e)
        {
            int index = list1.SelectedIndex;
            display.Text = list1.Items[index].ToString();
        }

        private void listBox1_SelectedIndexChanged_1(object sender, EventArgs e)
        {
            int index = list2.SelectedIndex;
            display.Text = list2.Items[index].ToString();
        }


    }
}

โปรแกรมที่ 12.5

โปรแกรมที่ 12 .6

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;

namespace program12_5
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void add_Click(object sender, EventArgs e)
        {
            string str = text.Text;
            listBox.Items.Add(str);

        }

        private void delete_Click(object sender, EventArgs e)
        {
            int index = listBox.SelectedIndex;
            listBox.Items.RemoveAt(index);

        }

        private void clear_Click(object sender, EventArgs e)
        {
            listBox.Items.Clear();
        }

        private void number_Click(object sender, EventArgs e)
        {
            MessageBox.Show("The number of items in the list is " +
                listBox.Items.Count.ToString());
        }
    }
}

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การบ้านครั้งที่ 8