private void bánHàngToolStripMenuItem_Click(object sender, EventArgs e) { DatHang frm = new DatHang(); frm.MdiParent = this; frm.Show(); }
private void buttonItem9_Click(object sender, EventArgs e) { DatHang dh = new DatHang(); dh.MdiParent = this; dh.Show(); // this.Hide(); }