Checked ListBox Control In C#

The following source code will provide the use of CheckedListBox Control In C#.

 

Source Code

using System;
using System.Windows.Forms;
using System.Drawing;
using System.ComponentModel;
class CheckedListBoxDemo : Form
{
    CheckedListBox FavLangs;
    GroupBox grpControls;
    Button AddValue;
    Button EditValue;
    Button DeleteValue;
    Button ShowValues;
    TextBox OldValue;
    TextBox NewValue;
    Label OldCaption;
    Label NewCaption;
    CheckBox chkAll;
    public CheckedListBoxDemo()
    {
        grpControls = new GroupBox();
        grpControls.Text = "CheckedListBox Demo";
        AddValue = new Button();
        AddValue.Text = "&Add";
        AddValue.Click += new EventHandler(Add_Click);
        EditValue = new Button();
        EditValue.Text = "&Edit";
        EditValue.Click += new EventHandler(Edit_Click);
        DeleteValue = new Button();
        DeleteValue.Text = "&Delete";
        DeleteValue.Click += new EventHandler(Delete_Click);
        ShowValues = new Button();
        ShowValues.Text = "&Show";
        ShowValues.Click += new EventHandler(ShowValues_Click);
        OldValue = new TextBox();
        OldValue.ReadOnly = true;
        NewValue = new TextBox();
        OldCaption = new Label();
        OldCaption.Text = "Old Value:";
        NewCaption = new Label();
        NewCaption.Text = "New Value:";
        chkAll = new CheckBox();
        chkAll.Text = "Check/UnCheck All";
        chkAll.CheckedChanged += new EventHandler(Checked_Changed);
        chkAll.Width = 175;
        OldCaption.Location = new Point(15, 15);
        PositionControl(OldCaption, OldValue, true);
        PositionControl(OldCaption, NewCaption, false);
        PositionControl(OldValue, NewValue, false);
        PositionControl(NewCaption, AddValue, false);
        PositionControl(AddValue, EditValue, true);
        PositionControl(EditValue, DeleteValue, true);
        PositionControl(DeleteValue, ShowValues, true);
        PositionControl(AddValue, chkAll, false);
        grpControls.Controls.AddRange(new Control[] { OldCaption, OldValue, NewCaption, NewValue, AddValue, EditValue, DeleteValue, ShowValues, chkAll });
        grpControls.Size = new Size(450, 200);
        FavLangs = new CheckedListBox();
        FavLangs.Location = new Point(10, 10);
        FavLangs.SelectedIndexChanged += new EventHandler(SelectedIndex_Changed);
        grpControls.Location = new Point(FavLangs.Left + FavLangs.Width + 20, FavLangs.Top);
        this.Controls.AddRange(new Control[] { FavLangs, grpControls });
    }
    private void PositionControl(Control source, Control destination, bool CanPlaceHorizontal)
    {
        if (CanPlaceHorizontal)
        {
            destination.Location = new Point(source.Left + source.Width + 20, source.Top);
        }
        else
        {
            destination.Location = new Point(source.Left, source.Top + source.Height + 20);
        }
    }
    private void Add_Click(object sender, EventArgs e)
    {
        if (NewValue.Text.Trim() != "")
        {
            FavLangs.Items.Add(NewValue.Text);
        }
        else
        {
            MessageBox.Show("Enter a Value to Add");
        }
    }
    private void SelectedIndex_Changed(object sender, EventArgs e)
    {
        OldValue.Text = FavLangs.Items[FavLangs.SelectedIndex].ToString();
    }
    private void Edit_Click(object sender, EventArgs e)
    {
        if (FavLangs.SelectedIndex == -1)
        {
            MessageBox.Show("Select a Item to Edit");
        }
        else
        {
            if (NewValue.Text.Trim() != "")
            {
                FavLangs.Items[FavLangs.SelectedIndex] = NewValue.Text;
            }
            else
            {
                MessageBox.Show("Enter a Value to Edit");
            }
        }
    }
    private void Delete_Click(object sender, EventArgs e)
    {
        if (FavLangs.SelectedIndex != -1)
        {
            FavLangs.Items.RemoveAt(FavLangs.SelectedIndex);
        }
        else
        {
            MessageBox.Show("Select a Item to Delete");
        }
    }
    private void ShowValues_Click(object sender, EventArgs e)
    {
        string SelectedValues = "The following value(s) are Selected:\n" + new String('-', 48) + "\n";
        for (int i = 0; i < FavLangs.CheckedItems.Count; i++)
        {
            SelectedValues += FavLangs.CheckedItems[i].ToString() + "\n";
        }
        MessageBox.Show(SelectedValues);
    }
    private void Checked_Changed(object sender, EventArgs e)
    {
        for (int i = 0; i < FavLangs.Items.Count; i++)
        {
            FavLangs.SetItemChecked(i, chkAll.Checked);
        }
    }
    public static void Main()
    {
        Application.Run(new CheckedListBoxDemo());
    }
}