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using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
namespace WindowsApplication1
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
if (checkedListBox1.Items.Count == 0)
{
button1.Enabled = false;
button3.Enabled = false;
}
}
int i=0;
private void button2_Click(object sender, EventArgs e)
{
i++;
checkedListBox1.Items.Add(i.ToString());
if (checkedListBox1.Items.Count > 0)
{
button1.Enabled = true;
button1.Text = "Select All";
}
}
int selectedIndex;
private void checkedListBox1_SelectedIndexChanged(object sender, EventArgs e)
{
selectedIndex = checkedListBox1.SelectedIndex;
button3.Enabled = true;
}
private void button3_Click(object sender, EventArgs e)
{
i = checkedListBox1.Items.Count-1;
do
{
if (checkedListBox1.GetItemChecked(i))
checkedListBox1.Items.RemoveAt(i);
i--;
} while (i >= 0);
}
private void button1_Click(object sender, EventArgs e)
{
bool state = false;
if (button1.Text.Equals("Select All"))
{
state = true;
button1.Text = "Unselect All";
}
else if (button1.Text.Equals("Unselect All"))
{
state = false;
button1.Text = "Select All";
}
for (int i = 0; i < checkedListBox1.Items.Count; i++)
{
checkedListBox1.SetItemChecked(i, state);
}
}
}
}
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