private void trảPhòngToolStripMenuItem_Click(object sender, EventArgs e)
 {
     frmTraPhong frm = new frmTraPhong();
     frm.Show();
 }
        private void trảPhòngToolStripMenuItem_Click(object sender, EventArgs e)
        {
            frmTraPhong frm = new frmTraPhong();

            frm.Show();
        }