private void dồnTúiBàiThiVàĐánhPháchToolStripMenuItem_Click(object sender, EventArgs e)
{
if (!CheckExitsFrom("FrmDonTuiRand"))
{
FrmDonTuiRand fm = new FrmDonTuiRand();
fm.MdiParent = this;
fm.Show();
}
else ActiveChildForm("FrmDonTuiRand");
}
private void button7_Click(object sender, EventArgs e)
{
FrmDonTuiRand f = new FrmDonTuiRand();
f.Show();
}