การบ้านครั้งที่ 8


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 list2_SelectedIndexChanged(object sender, EventArgs e)

        {

            int index = list2.SelectedIndex;

            display.Text = list2.Items[index].ToString();

        }

    }

}


12.5

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;

            listBox1.Items.Add(str);
        }
    }

}

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 WindowsFormsApplication1

{
    public partial class Form1 : Form

    {
        public Form1()
        {
            InitializeComponent();
        }
        private void add_Click(object sender, EventArgs e)

        {
            string str = text.Text;

            listBox1.Items.Add(str);
        }
        private void delete_Click(object sender, EventArgs e)

        {
            int index = listBox1.SelectedIndex;

            listBox1.Items.RemoveAt(index);

        }

        private void clear_Click(object sender, EventArgs e)

        {
            listBox1.Items.Clear();
        }

    }

}

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