private void btn_qlphong_Click(object sender, EventArgs e)
{
this.panel2.Controls.Clear();
frm_Phong dv = new frm_Phong();
dv.TopLevel = false;
this.panel2.Controls.Add(dv);
dv.Show();
}
private void btn_thoat_Click(object sender, EventArgs e)
{
DialogResult r;
r = MessageBox.Show("Bạn thật sự muốn thoát?", "Thông báo", MessageBoxButtons.YesNo, MessageBoxIcon.Question);
if (r == DialogResult.Yes)
{
this.Close();
}
frm_Phong frm = new frm_Phong();
frm.Show();
}