private void tổngQuanToolStripMenuItem_Click(object sender, EventArgs e)
{
TongQuan tq = new TongQuan();
tq.MdiParent = this;
tq.Show();
}
private void Trangchu_Load(object sender, EventArgs e)
{
Class.Function.Connect(); //Mở kết nối
TongQuan tq = new TongQuan();
tq.MdiParent = this;
tq.Show();
}