private void btndangxuat_Click(object sender, EventArgs e)
{
frmmainquanlykhachsan.ActiveForm.Close();
frmdangnhap frm = new frmdangnhap();
frm.Show();
}
//Thoat khỏi form hien tai, tro lai form dang nhap
private void button1_Click(object sender, EventArgs e)
{
this.Hide();
frmdangnhap frm = new frmdangnhap();
frm.Show();
}
