private void QLKHACH_BTN_Click(object sender, EventArgs e)
{
QLKHACH form = new QLKHACH();
form.Show();
this.Close();
}
private void QLKHACK_BTN_Click(object sender, EventArgs e)
{
//Tạo form
QLKHACH form = new QLKHACH();
form.Show();
this.Visible = false;
}