private void btDangNhap_Click(object sender, EventArgs e)
{
formDangNhap loginForm = new formDangNhap();
loginForm.Show();
Visible = false;
}
private void formDangNhap_FormClosed(object sender, FormClosedEventArgs e)
{
if (MessageBox.Show("Do you really want to exit ?", "Notification", MessageBoxButtons.YesNo, MessageBoxIcon.Question) == DialogResult.Yes)
{
Application.Exit();
}
else
{
formDangNhap fDN = new formDangNhap();
fDN.Show();
}
}