private void btn_Next_Click_1(object sender, EventArgs e)
        {
            Frm_Bill_Receipt obj = new Frm_Bill_Receipt();

            this.Hide();
            obj.Show();
        }
        private void btn_Next_Click(object sender, EventArgs e)
        {
            Frm_Bill_Receipt obj = new Frm_Bill_Receipt();

            //obj.MdiParent=this;
            obj.StartPosition = FormStartPosition.CenterParent;
            obj.ControlBox    = false;
            obj.Show();
        }