private void inDanhSáchẢnhToolStripMenuItem_Click(object sender, EventArgs e)
{
if (!CheckExitsFrom("FrmDsAnh"))
{
FrmDsAnh fm = new FrmDsAnh();
fm.MdiParent = this;
fm.Show();
}
else ActiveChildForm("FrmDsAnh");
}
private void button1_Click(object sender, EventArgs e)
{
FrmDsAnh f = new FrmDsAnh();
f.Show();
}