private void btnTroVe_Click(object sender, EventArgs e)
{
this.Hide();
QuanLyLop qll = new QuanLyLop();
qll.Show();
}
private void btnDN_Click(object sender, EventArgs e)
{
string userName = txtTenDN.Text.Trim();
string pass = txtMK.Text.Trim();
if (kiemTraThongTin(userName, pass) == true)
{
if (ud.DangNhap(userName, pass) == true)
{
MessageBox.Show("Dang nhap thanh cong");
this.Hide();
QuanLyLop qll = new QuanLyLop();
qll.Show();
}
else
{
MessageBox.Show("Dang nhap that bai");
}
}
}