public void mbtnReturn_Click(object sender, EventArgs e)
        {
            this.Hide();
            frm7Return f = new frm7Return();

            f.Name     = this.Name;
            f.Location = this.Location;
            f.ShowDialog();
            this.Close();
        }
        private void btnReturn_Click(object sender, EventArgs e)
        {
            //launch form Return
            //fill all required the customer informations
            this.Hide();
            frm7Return f = new frm7Return();

            f.Location = this.Location;
            f.SetMemberID(m.MemberID.ToString());

            f.ShowDialog();
            this.Close();
        }