datagridview 에 checkbox 표시하기, 일련번호 , 마우스로 column sizw 조절 못하게 하기.

datagridview_checkbox.cs

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace datagridview_checkbox
{
    public partial class Form1 : Form
    {
        private List<Stock> _stockList = new List<Stock>();

        private DataTable _dt = new DataTable();   // original data 

        public Form1()
        {
            InitializeComponent();

            this._stockList.Add(new Stock() { StockCode = "005930", StockName = "삼성전자", Price = 44750 });
            this._stockList.Add(new Stock() { StockCode = "068270", StockName = "셀트리온", Price = 213500 });
            this._stockList.Add(new Stock() { StockCode = "215600", StockName = "신라젠", Price = 64100 });
            this._stockList.Add(new Stock() { StockCode = "003490", StockName = "대한항공", Price = 34350 });
            this._stockList.Add(new Stock() { StockCode = "011150", StockName = "CJ씨푸드", Price = 3130 });

        }

        private void Form1_Load(object sender, EventArgs e)
        {
            this.makeDataTable();

            this.dataGridView1.DataSource = this._dt;

            this.dataGridView1.AllowUserToAddRows = false;
            this.dataGridView1.Columns[0].Width = 20;

            this.dataGridView1.RowHeadersWidthSizeMode = DataGridViewRowHeadersWidthSizeMode.DisableResizing;
            this.dataGridView1.Columns[0].Resizable = DataGridViewTriState.False;
            this.dataGridView1.Columns[1].ReadOnly = true;
            this.dataGridView1.Columns[2].ReadOnly = true;
            this.dataGridView1.Columns[3].ReadOnly = true;
        }
        
        private void makeDataTable()
        {
            _dt.Columns.Add(" ", typeof(bool));  // 선택 체크박스 용
            _dt.Columns.Add("종목코드", typeof(string));
            _dt.Columns.Add("종목명", typeof(string));
            _dt.Columns.Add("가격", typeof(int));

            foreach (var stock in _stockList)
            {
                _dt.Rows.Add(false, stock.StockCode, stock.StockName, stock.Price);
            }
        }

        // row header 에 자동 일련번호 넣기
        private void dataGridView1_RowPostPaint(object sender, DataGridViewRowPostPaintEventArgs e)
        {
            StringFormat drawFormat = new StringFormat();
            //drawFormat.FormatFlags = StringFormatFlags.DirectionVertical;
            drawFormat.FormatFlags = StringFormatFlags.DirectionRightToLeft;

            using (Brush brush = new SolidBrush(Color.Red))
            {
                e.Graphics.DrawString((e.RowIndex + 1).ToString(), e.InheritedRowStyle.Font, 
                    brush, e.RowBounds.Location.X + 35, e.RowBounds.Location.Y + 4, drawFormat);
            }
        }

        // checkBox 변경 상태를 확실히 반영하기 위함.
        private void dataGridView1_CurrentCellDirtyStateChanged(object sender, EventArgs e)
        {
            if (dataGridView1.CurrentCell is DataGridViewCheckBoxCell)
            {
                dataGridView1.CommitEdit(DataGridViewDataErrorContexts.Commit);
            }
        }

        private void button1_Click(object sender, EventArgs e)
        {
            foreach(DataRow dr in _dt.Rows)
            {
                Console.WriteLine($"checkbox 상태 = {dr[0]}");
            }
        }
    }

    public class Stock
    {
        public string StockCode { get; set; }
        public string StockName { get; set; }
        public int Price { get; set; }
    }
}