public DOIMATKHAU(string loginname, string pass)
{
InitializeComponent();
data = new Class_connect();
lgname = loginname;
pw = pass;
check = new kiemtradoimatkhau();
}
public Class_dangnhap()
{
dulieu = new Class_connect();
}
public Class_BANGLUONG()
{
data = new Class_connect();
}