private void buttonItem11_Click(object sender, EventArgs e) { HoaDonBan hdb = new HoaDonBan(); hdb.MdiParent = this; hdb.Show(); // this.Hide(); }
private void hóaĐơnBánToolStripMenuItem_Click(object sender, EventArgs e) { HoaDonBan frm = new HoaDonBan(); frm.MdiParent = this; frm.Show(); }