private void button5_Click(object sender, EventArgs e)
        {
            delete l = new delete("BLOOD");

            l.Show();
            this.Hide();
        }
        private void button4_Click(object sender, EventArgs e)
        {
            delete form_del = new delete(button4.Text);

            form_del.Show();
            this.Close();
            this.Hide();
        }