When i Click Grid View ColumnHeader its Fire My Delete Code which i Put in Gride View Button... How To Solve it?

private void dataGridView1_CellContentClick(object sender, DataGridViewCellEventArgs e)
        {


            if (dataGridView1.CurrentCell.Value.ToString().Equals("Delete"))
            {
                DialogResult res = MessageBox.Show("Are you sure you want to delete the item?", "Shayona", MessageBoxButtons.YesNo, MessageBoxIcon.Question);
                if (res == DialogResult.Yes)
                {
                    conn.Open();
                    int id = Int32.Parse(dataGridView1.CurrentRow.Cells[6].Value.ToString());
                    str = "delete from branchdetails where BranchID=" + id;
                    cmd = new MySqlCommand(str, conn);
                    cmd.ExecuteNonQuery();
                    conn.Close();
                }
}