private void btnTru_Click(object sender, EventArgs e)
{
formPhepTru formPhepTru = new formPhepTru();
formPhepTru.Show();
this.WindowState = FormWindowState.Minimized;
}
private void trừToolStripMenuItem_Click(object sender, EventArgs e)
{
Form PC = new formPhepTru();
PC.Show();
}