private void GiaoDichHoaDonBan_Click(object sender, EventArgs e)
 {
     try
     {
         QuanLyBanHang.GiaoDich.F220_Hoa_don_ban v_frm = new GiaoDich.F220_Hoa_don_ban();
         v_frm.Show();
     }
     catch (Exception v_e)
     {
         MessageBox.Show(v_e.ToString());
     }
 }
 private void m_llb_hoa_don_ban_LinkClicked(object sender, LinkLabelLinkClickedEventArgs e)
 {
     QuanLyBanHang.GiaoDich.F220_Hoa_don_ban v_frm = new GiaoDich.F220_Hoa_don_ban();
     v_frm.ShowDialog();
 }
 private void DanhMucHoaDonBan_Click(object sender, EventArgs e)
 {
     QuanLyBanHang.GiaoDich.F220_Hoa_don_ban v_frm = new GiaoDich.F220_Hoa_don_ban();
     v_frm.ShowDialog();
 }