ส่งการบ้านครั้งที่ 8

โปรเเกรมที่ 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 WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        private void list1_SelectedIndexChanged(object sender, EventArgs e)
        {
            int index = list1.SelectedIndex;
            display.Text = list1.Items[index].ToString();
        }
        private void listBox2_SelectedIndexChanged(object sender, EventArgs e)
        {
            int index = list2.SelectedIndex;
            display.Text = list2.Items[index].ToString();
        }

       
    }
}


โปรเเกรมที่12.5

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 WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void add_Click(object sender, EventArgs e)
        {
            string str = text.Text;
            listBox.Items.Add(str);
        }
    }
}
โปรเเกรมที่ 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 _12._6
{
    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();
        }
    }
}