private void btdangxuat_Click(object sender, EventArgs e)
{
Form a = new dangnhap();
a.Show();
this.Hide();
}
private void đăngXuấtToolStripMenuItem_Click(object sender, EventArgs e)
{
Form a = new dangnhap();
a.Show();
this.Hide();
}
private void button1_Click_1(object sender, EventArgs e)
{
Form a = new dangnhap();
a.Show();
this.Hide();
}
private void quenmk_FormClosed(object sender, FormClosedEventArgs e)
{
Form a = new dangnhap();
a.Show();
}