private void txtremarks_KeyDown(object sender, KeyEventArgs e)
 {
     if (e.KeyCode == Keys.Enter)
     {
         BtnPayment.Focus();
     }
 }
        private void Sale_KeyDown(object sender, KeyEventArgs e)
        {
            if (e.KeyCode == Keys.Escape)
            {
                this.Close();
            }

            if (e.Alt == true && e.KeyCode == Keys.S)
            {
                BtnPayment.PerformClick();
            }
        }