private void đánhSốBáoDanhToolStripMenuItem_Click(object sender, EventArgs e)
{
if (!CheckExitsFrom("DanhSBD"))
{
DanhSBD fm = new DanhSBD();
fm.MdiParent = this;
fm.Show();
}
else ActiveChildForm("DanhSBD");
}
private void button11_Click_1(object sender, EventArgs e)
{
DanhSBD f = new DanhSBD();
f.Show();
}