private void quảnLýKháchHàngToolStripMenuItem_Click(object sender, EventArgs e) { QuanLyKhachHang frmQLKH = new QuanLyKhachHang(); foreach (Form frm in MdiChildren) { frm.Close(); } frmQLKH.MdiParent = this; frmQLKH.Show(); }
private void quảnLýKháchHàngToolStripMenuItem_Click(object sender, EventArgs e) { QuanLyKhachHang frmQLKH = new QuanLyKhachHang(); hienForm(frmQLKH); }