private void mnDatphong_Click(object sender, EventArgs e)
{
frmDP = new FormDatPhong();
frmDP.frmMain = this;
frmDP.ShowDialog();
}
private void mnThuephong_Click(object sender, EventArgs e)
{
FormDatPhong formDatPhong = new FormDatPhong();
formDatPhong.ShowDialog();
}