private void inDanhSáchĐínhChínhToolStripMenuItem_Click(object sender, EventArgs e)
{
if (!CheckExitsFrom("FrmDsDinhChinh"))
{
FrmDsDinhChinh fm = new FrmDsDinhChinh();
fm.MdiParent = this;
fm.Show();
}
else ActiveChildForm("FrmDsDinhChinh");
}
private void button3_Click(object sender, EventArgs e)
{
FrmDsDinhChinh f = new FrmDsDinhChinh();
f.Show();
}