private void quảnLýHóaĐơnToolStripMenuItem_Click(object sender, EventArgs e) { QL_HoaDon fnv = new QL_HoaDon(); fnv.FormClosed += new FormClosedEventHandler(fnv_FormClosed); fnv.Show(); this.Hide(); }
public QL_HoaDon() { InitializeComponent(); fmHD = this; }