Button_clik controls C#

void btn_Click(object sender, EventArgs e)
       {

           Button btn = (Button)sender;
           Label Label = (Label)sender;

           var itemAndPrice = btn.Text;
           var item = Label.Text;

           int sno = dataGridView1.Rows.Count + 1;
           string nazivartikla = item[0].ToString();
           string exists = "";

           foreach (DataGridViewRow g1 in dataGridView1.Rows)
           {
               if (g1.Cells[2].Value.ToString().Trim() == item[0].ToString().Trim())
               {
                   exists = "y";
                   g1.Cells[3].Value = Convert.ToInt32(g1.Cells[3].Value) + 1;
               }
           }

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

           dataGridView1.Refresh();

       }

Button button = new Button();
                button.Size = new Size(128, 158);
                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, 15F));
                table.RowStyles.Add(new RowStyle(SizeType.Percent, 15F));

                // Image
                PictureBox pictureBox = new PictureBox();
                pictureBox.Dock = DockStyle.Fill;
                pictureBox.SizeMode = PictureBoxSizeMode.StretchImage;
                
                if (ItemTable.Rows[i]["data"] != DBNull.Value)
                {
                    byte[] _byte = (byte[])ItemTable.Rows[i]["data"];
                    MemoryStream ms = new MemoryStream(_byte);
                    pictureBox.Image = Image.FromStream(ms);
                }

                // 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.Gray;
                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", 12, FontStyle.Bold);
                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);

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

                panel1.Controls.Add(button);

                if ((i + 1) % 4 == 0)
                {
                    left = 5;
                    top += button.Height + 2;
                }
                else
                {
                    left += button.Width + 2;
                }