I am starting a blackjack game  using c# graphics. here is my starting code.

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;
using System.Drawing.Imaging;

    
namespace WindowsFormsApp1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        public void Form1_Load(object sender, EventArgs e)
        {

        }

        public static List<T> Shuffle<T>(List<T> list)
        {
            Random rnd = new Random(DateTime.Now.Millisecond);
            var randomised = list.Select(item => new { item, order = rnd.Next() })
                .OrderBy(x => x.order)
                .Select(x => x.item)
                .ToList();

            return randomised;
        }

        private void Form1_MouseDown(object sender, MouseEventArgs e)
        {
            Bitmap bitmap_ace_club = new Bitmap("c01.bmp", true);
            Bitmap bitmap_two_club = new Bitmap("c02.bmp", true);
            Bitmap bitmap_three_club = new Bitmap("c03.bmp", true);
            Bitmap bitmap_four_club = new Bitmap("c04.bmp", true);
            Bitmap bitmap_five_club = new Bitmap("c05.bmp", true);
            Bitmap bitmap_six_club = new Bitmap("c06.bmp", true);
            Bitmap bitmap_seven_club = new Bitmap("c07.bmp", true);
            Bitmap bitmap_eight_club = new Bitmap("c08.bmp", true);
            Bitmap bitmap_nine_club = new Bitmap("c09.bmp", true);
            Bitmap bitmap_ten_club = new Bitmap("c10.bmp", true);
            Bitmap bitmap_jack_club = new Bitmap("c11.bmp", true);
            Bitmap bitmap_queen_club = new Bitmap("c12.bmp", true);
            Bitmap bitmap_king_club = new Bitmap("c13.bmp", true);

            Bitmap bitmap_ace_diamond = new Bitmap("d01.bmp", true);
            Bitmap bitmap_two_diamond = new Bitmap("d02.bmp", true);
            Bitmap bitmap_three_diamond = new Bitmap("d03.bmp", true);
            Bitmap bitmap_four_diamond = new Bitmap("d04.bmp", true);
            Bitmap bitmap_five_diamond = new Bitmap("d05.bmp", true);
            Bitmap bitmap_six_diamond = new Bitmap("d06.bmp", true);
            Bitmap bitmap_seven_diamond = new Bitmap("d07.bmp", true);
            Bitmap bitmap_eight_diamond = new Bitmap("d08.bmp", true);
            Bitmap bitmap_nine_diamond = new Bitmap("d09.bmp", true);
            Bitmap bitmap_ten_diamond = new Bitmap("d10.bmp", true);
            Bitmap bitmap_jack_diamond = new Bitmap("d11.bmp", true);
            Bitmap bitmap_queen_diamond = new Bitmap("d12.bmp", true);
            Bitmap bitmap_king_diamond = new Bitmap("d13.bmp", true);

            Bitmap bitmap_ace_heart = new Bitmap("h01.bmp", true);
            Bitmap bitmap_two_heart = new Bitmap("h02.bmp", true);
            Bitmap bitmap_three_heart = new Bitmap("h03.bmp", true);
            Bitmap bitmap_four_heart = new Bitmap("h04.bmp", true);
            Bitmap bitmap_five_heart = new Bitmap("h05.bmp", true);
            Bitmap bitmap_six_heart = new Bitmap("h06.bmp", true);
            Bitmap bitmap_seven_heart = new Bitmap("h07.bmp", true);
            Bitmap bitmap_eight_heart = new Bitmap("h08.bmp", true);
            Bitmap bitmap_nine_heart = new Bitmap("h09.bmp", true);
            Bitmap bitmap_ten_heart = new Bitmap("h10.bmp", true);
            Bitmap bitmap_jack_heart = new Bitmap("h11.bmp", true);
            Bitmap bitmap_queen_heart = new Bitmap("h12.bmp", true);
            Bitmap bitmap_king_heart = new Bitmap("h13.bmp", true);

            Bitmap bitmap_ace_spade = new Bitmap("s01.bmp", true);
            Bitmap bitmap_two_spade = new Bitmap("s02.bmp", true);
            Bitmap bitmap_three_spade = new Bitmap("s03.bmp", true);
            Bitmap bitmap_four_spade = new Bitmap("s04.bmp", true);
            Bitmap bitmap_five_spade = new Bitmap("s05.bmp", true);
            Bitmap bitmap_six_spade = new Bitmap("s06.bmp", true);
            Bitmap bitmap_seven_spade = new Bitmap("s07.bmp", true);
            Bitmap bitmap_eight_spade = new Bitmap("s08.bmp", true);
            Bitmap bitmap_nine_spade = new Bitmap("s09.bmp", true);
            Bitmap bitmap_ten_spade = new Bitmap("s10.bmp", true);
            Bitmap bitmap_jack_spade = new Bitmap("s11.bmp", true);
            Bitmap bitmap_queen_spade = new Bitmap("s12.bmp", true);
            Bitmap bitmap_king_spade = new Bitmap("s13.bmp", true);

            List<int> cards = new List<int>(52);

            for (int i = 0; i < 52; i++)
            {
                cards.Add(i);
            }
            cards = Shuffle(cards);
            if (e.Button == MouseButtons.Left)
            {
                Graphics g1 = this.CreateGraphics();
                g1.DrawImage(bitmap_king_spade, 360, 20);
                g1.Dispose();
            }
        }

        private void Form1_Paint(object sender, PaintEventArgs e)
        {

        }
    }
}