private void Form1_Load(object sender, EventArgs e)
        {
            DAL.Voucher vcr = new DAL.Voucher();
            DataTable   dt  = vcr.Select().Tables[0];

            for (int i = 0; i < dt.Rows.Count; i++)
            {
                ToolStripMenuItem mnu = new ToolStripMenuItem();
                mnu.Text   = dt.Rows[i].ItemArray[1].ToString();
                mnu.Tag    = dt.Rows[i].ItemArray[0].ToString();
                mnu.Click += Mnu_Click;
                mnuVoucher.DropDownItems.Add(mnu);
            }
        }
 private void btnSearch_Click(object sender, EventArgs e)
 {
     DAL.Voucher voucher = new DAL.Voucher();
     dgvVoucher.DataSource = voucher.Select().Tables[0];
 }