Adding CheckBox to ComboBox in Windows Application

Hi PRA,

Please refer below sample.

In this sample i used comboBox, checkbox and toolscript control.

I have created this sample by using below link, so refere below link.

https://www.codeproject.com/Articles/18929/An-OwnerDraw-ComboBox-with-CheckBoxes-in-the-Drop

Form Design

Code

Form1.cs

public partial class Form1 : Form
{
    public Form1()
    {
        InitializeComponent();
        checkComboBox1.Items.Add(new CheckComboBox.CheckComboBoxItem("Mudassar", true));
        checkComboBox1.Items.Add(new CheckComboBox.CheckComboBoxItem("Ahmad", true));
        checkComboBox1.Items.Add(new CheckComboBox.CheckComboBoxItem("Khan", true));
        checkBox1.Visible = false;
        checkBox2.Visible = false;
        checkBox3.Visible = false;
        this.checkComboBox1.CheckStateChanged += new System.EventHandler(this.checkComboBox1_CheckStateChanged);
    }

    private void checkComboBox1_CheckStateChanged(object sender, EventArgs e)
    {
        if (sender is CheckComboBox.CheckComboBoxItem)
        {
            CheckComboBox.CheckComboBoxItem item = (CheckComboBox.CheckComboBoxItem)sender;
            switch (item.Text)
            {
                case "Mudassar":
                    checkBox1.Checked = item.CheckState;
                    break;
                case "Ahmed":
                    checkBox2.Checked = item.CheckState;
                    break;
                case "Khan":
                    checkBox3.Checked = item.CheckState;
                    break;
            }
        }
    }
}

CheckComboBox.cs

using System;
using System.Drawing;
using System.Windows.Forms;
using System.Windows.Forms.VisualStyles;

namespace CheckComboBox
{

    public class CheckComboBoxItem
    {
        public CheckComboBoxItem(string text, bool initialCheckState)
        {
            _checkState = initialCheckState;
            _text = text;
        }

        private bool _checkState = false;
        public bool CheckState
        {
            get { return _checkState; }
            set { _checkState = value; }
        }

        private string _text = "";
        public string Text
        {
            get { return _text; }
            set { _text = value; }
        }

        private object _tag = null;
        public object Tag
        {
            get { return _tag; }
            set { _tag = value; }
        }
        public override string ToString()
        {
            return "Select Options";
        }
    }

    public partial class CheckComboBox : ComboBox
    {
        public CheckComboBox()
        {
            this.DrawMode = DrawMode.OwnerDrawFixed;
            this.DrawItem += new DrawItemEventHandler(CheckComboBox_DrawItem);
            this.SelectedIndexChanged += new EventHandler(CheckComboBox_SelectedIndexChanged);
            SelectedText = "Select Options";
        }

        void CheckComboBox_SelectedIndexChanged(object sender, EventArgs e)
        {
            CheckComboBoxItem item = (CheckComboBoxItem)SelectedItem;
            item.CheckState = !item.CheckState;
            if (CheckStateChanged != null)
                CheckStateChanged(item, e);
        }

        void CheckComboBox_DrawItem(object sender, DrawItemEventArgs e)
        {
            if (e.Index == -1)
            {
                return;
            }

            if (!(Items[e.Index] is CheckComboBoxItem))
            {
                e.Graphics.DrawString(
                    Items[e.Index].ToString(),
                    this.Font,
                    Brushes.Black,
                    new Point(e.Bounds.X, e.Bounds.Y));
                return;
            }

            CheckComboBoxItem box = (CheckComboBoxItem)Items[e.Index];
            CheckBoxRenderer.RenderMatchingApplicationState = true;
            CheckBoxRenderer.DrawCheckBox(
                e.Graphics,
                new Point(e.Bounds.X, e.Bounds.Y),
                e.Bounds,
                box.Text,
                this.Font,
                (e.State & DrawItemState.Focus) == 0,
                box.CheckState ? CheckBoxState.CheckedNormal : CheckBoxState.UncheckedNormal);
        }
        public event EventHandler CheckStateChanged;

    }
}

Screenshot