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;
IistBox.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;
IistBox.Items.Add(str);
}
private void delete_Click(object sender, EventArgs e)
{
int index = IistBox.SelectedIndex;
IistBox.Items.RemoveAt(index);
}
private void clear_Click(object sender, EventArgs e)
{
IistBox.Items.Clear();
}
private void number_Click(object sender, EventArgs e)
{
MessageBox.Show("The number of items in the list is" +
IistBox.Items.Count.ToString());
}
}
}
