private void quảnLýSáchToolStripMenuItem_Click(object sender, EventArgs e) { frmHoaDon_CTHD dt = new frmHoaDon_CTHD(); dt.Show(); this.Hide(); }
private void btn_Click(object sender, EventArgs e) { frmHoaDon_CTHD dt = new frmHoaDon_CTHD(); dt.Show(); this.Hide(); }