private void mnuBuuGui_Click(object sender, EventArgs e)
        {
            frmQuanLyBuuGui quanLiBuuGui = new frmQuanLyBuuGui();

            quanLiBuuGui.Show();
        }
        private void btnBuuGui_Click(object sender, EventArgs e)
        {
            frmQuanLyBuuGui frmbuuGui = new frmQuanLyBuuGui();

            frmbuuGui.Show();
        }