private void button1_Click(object sender, EventArgs e)
{
this.Hide();
frmdangnhap frm = new frmdangnhap();
frm.Show();
}
private void btnsua_Click(object sender, EventArgs e)
{
temp = 2;
trangthai(true);
this.Hide();
frmdangnhap frm = new frmdangnhap();
frm.Show();
}
