// MDI frmHoaDonBanHang void MoFormHoaDonBanHang() { Form frm = KiemTraFormTonTai(typeof(frmHoaDonBanHang)); if (frm != null) { frm.Activate(); } else { frmHoaDonBanHang m_frmHoaDonThanhToan = new frmHoaDonBanHang(_tenTK); m_frmHoaDonThanhToan.MdiParent = this; m_frmHoaDonThanhToan.Dock = DockStyle.Fill; m_frmHoaDonThanhToan.Show(); } }
private void frmHoaDonThanhToan_FormClosed(object sender, FormClosedEventArgs e) { _Instance = null; }