private void inGiấyBáoDựThiToolStripMenuItem_Click(object sender, EventArgs e)
{
if (!CheckExitsFrom("danhsachduthi"))
{
DanhSachDuThi fm = new DanhSachDuThi();
fm.MdiParent = this;
fm.Show();
}
else ActiveChildForm("danhsachduthi");
}
private void button5_Click(object sender, EventArgs e)
{
DanhSachDuThi f = new DanhSachDuThi();
f.Show();
}