Button click control c#

My code for button

Button btn = (Button)sender;
var itemAndPrice = btn.Text;

int sno = dataGridView1.Rows.Count + 1;
string nazivartikla = itemAndPrice.Split('-')[0].ToString();
double cijena = Convert.ToDouble(itemAndPrice.Split('-')[1].ToString());
string exists = "";
NazivArtiklaTextBox.Text = nazivartikla;
Provjera_stanja();
Sifra_i_Podgrupa_robe();

foreach (DataGridViewRow g1 in dataGridView1.Rows)
{
    if (g1.Cells[2].Value.ToString().Trim() == itemAndPrice.Split('-')[0].ToString().Trim())
    {
        exists = "y";
        g1.Cells[3].Value = Convert.ToInt32(g1.Cells[3].Value) + 1;
        g1.Cells[5].Value = Convert.ToDouble(g1.Cells[3].Value) * Convert.ToDouble(g1.Cells[4].Value);
    }
}

if (exists != "y")
{
    dataGridView1.Rows.Add(sno, SifraTextBox.Text, nazivartikla, 1, cijena, cijena);
}

double[] columnData = new double[dataGridView1.Rows.Count];
columnData = (from DataGridViewRow row in dataGridView1.Rows
              where row.Cells["kolicina"].FormattedValue.ToString() != string.Empty
              select Convert.ToDouble(row.Cells["kolicina"].FormattedValue)).ToArray();
kolicinalabel.Text = columnData.Sum().ToString("0.00");

double[] columnData2 = new double[dataGridView1.Rows.Count];
columnData2 = (from DataGridViewRow row in dataGridView1.Rows
               where row.Cells["ukupno"].FormattedValue.ToString() != string.Empty
               select Convert.ToDouble(row.Cells["ukupno"].FormattedValue)).ToArray();
ukupnolabel.Text = columnData2.Sum().ToString("0.00");
UkupnobezpdvLabel.Text = columnData2.Sum().ToString("0.00");
label15.Text = columnData2.Sum().ToString("0.00");


double ukupno;
if (!double.TryParse(ukupnolabel.Text, out ukupno))
{
    // ... report problem to user ...
    return;
}
double lab3;
if (!double.TryParse(label3.Text, out lab3))
{
    //... report problem to user ...
    return;
}
label4.Text = (ukupno * lab3 / 100.0).ToString("0.00");


dataGridView1.Refresh();

my code for control button in line 123 call button click function but not work

private void TopliNapitciButton_Click(object sender, EventArgs e)
{
    panel1.Controls.Clear();

    string conString = ConnectionClass.PullData(labelgodina.Text);
    SqlConnection con = new SqlConnection(conString);
    SqlCommand cmd = new SqlCommand("SELECT naziv, FORMAT(cijena_sa_porezom, 'N2') AS cijena, data FROM dbo.roba_usluge where grupa_artikala='Napitci' and status='Aktivan'", con);
    // SqlCommand cmd = new SqlCommand("SELECT naziv+' - '+CAST(FORMAT(cijena_sa_porezom, 'N2') AS varchar), data FROM dbo.roba_usluge where grupa_artikala='Napitci' and status='Aktivan'", con);

    var da = new SqlDataAdapter(cmd);
    var ItemTable = new DataTable();
    da.Fill(ItemTable);

    con.Open();
    Int32 count = ItemTable.Rows.Count;
    con.Close();

    int top = 270;
    int left = 8;
    for (int i = 0; i < count; i++)
    {
        int currentIndex = i;

        Button button = new Button();
        button.Size = new Size(153, 200);
        button.BackColor = Color.Transparent;
        button.FlatAppearance.BorderSize = 0;
        button.Font = new System.Drawing.Font("Roboto", 10);
        button.TextAlign = ContentAlignment.BottomCenter;
        button.BackgroundImageLayout = ImageLayout.Zoom;

        // Create TableLayoutPanel
        TableLayoutPanel table = new TableLayoutPanel();
        table.Dock = DockStyle.Fill;
        table.RowCount = 3;
        table.RowStyles.Add(new RowStyle(SizeType.Percent, 70F));
        table.RowStyles.Add(new RowStyle(SizeType.Percent, 18F));
        table.RowStyles.Add(new RowStyle(SizeType.Percent, 12F));

        // Image
        PictureBox pictureBox = new PictureBox();
        pictureBox.Dock = DockStyle.Fill;
        pictureBox.SizeMode = PictureBoxSizeMode.StretchImage;
        pictureBox.BackColor = Color.FromArgb(63, 77, 103);
        //pictureBox.Region = Region.FromHrgn(CreateRoundRectRgn(0, 0, pictureBox.Width, pictureBox.Height, 1, 1));

        if (ItemTable.Rows[i]["data"] != DBNull.Value)
        {
            byte[] _byte = (byte[])ItemTable.Rows[i]["data"];
            MemoryStream ms = new MemoryStream(_byte);
            pictureBox.Image = Image.FromStream(ms);
        }
        else
        {
            // If the image data is null, assign a default image
            pictureBox.Image = Properties.Resources.Empty2024x32;
            pictureBox.SizeMode = PictureBoxSizeMode.CenterImage;
        }

        // Label for name
        Label nameLabel = new Label();
        nameLabel.Dock = DockStyle.Fill;
        nameLabel.TextAlign = ContentAlignment.MiddleCenter;
        nameLabel.Font = new System.Drawing.Font("Roboto", 12, FontStyle.Bold);
        nameLabel.ForeColor = System.Drawing.Color.White;  //Bilo GRAY
        nameLabel.BackColor = System.Drawing.Color.FromArgb(63, 77, 103);
        nameLabel.Text = ItemTable.Rows[i]["naziv"].ToString();

        // Label for price
        Label priceLabel = new Label();
        priceLabel.Dock = DockStyle.Fill;
        priceLabel.TextAlign = ContentAlignment.MiddleCenter;
        priceLabel.ForeColor = System.Drawing.Color.DarkOrange;
        priceLabel.Font = new System.Drawing.Font("Roboto", 14, FontStyle.Bold);
        priceLabel.BackColor = System.Drawing.Color.FromArgb(63, 77, 103);
        priceLabel.Text = ItemTable.Rows[i]["cijena"].ToString() + " KM";

        // Add controls to TableLayoutPanel
        table.Controls.Add(pictureBox, 0, 0);
        table.Controls.Add(nameLabel, 0, 1);
        table.Controls.Add(priceLabel, 0, 2);

        button.Left = left;
        button.Top = top;

        // Add TableLayoutPanel to button
        button.Controls.Add(table);
        panel1.Controls.Add(button);



        pictureBox.Click += (s, ev) =>
        {
            // Access the captured currentIndex instead of i
            string itemName = ItemTable.Rows[currentIndex]["naziv"].ToString();
            string itemPrice = ItemTable.Rows[currentIndex]["cijena"].ToString();

            // Insert into DataGridView
            int sno = dataGridView1.Rows.Count + 1;
            string nazivartikla = itemName;
            double cijena = Convert.ToDouble(itemPrice.Replace(" KM", ""));
            string exists = "";
            NazivArtiklaTextBox.Text = nazivartikla;
            Sifra_i_Podgrupa_robe();
            Provjera_stanja();

            foreach (DataGridViewRow row in dataGridView1.Rows)
            {
                if (row.Cells[2].Value != null && row.Cells[2].Value.ToString().Trim() == nazivartikla)
                {
                    exists = "y";
                    row.Cells[3].Value = Convert.ToInt32(row.Cells[3].Value) + 1;
                    row.Cells[5].Value = Convert.ToDouble(row.Cells[3].Value) * Convert.ToDouble(row.Cells[4].Value);
                    break; // Exit loop once found
                }
            }

            if (exists != "y")
            {
                dataGridView1.Rows.Add(sno, SifraTextBox.Text, nazivartikla, 1, cijena, cijena);
            }

            button.Click += new EventHandler(this.btn_Click);

            dataGridView1.Refresh();
        };


        if ((i + 1) % 5 == 0)
        {
            left = 8;
            top += button.Height + 2;
        }
        else
        {
            left += button.Width + 2;
        }
    }
}