public Khachhang(Khachhang kh)
{
Makh = string.Copy(kh.makh);
TenKH = string.Copy(kh.tenkhachhang);
SDT = kh.sdt;
Diachi = string.Copy(kh.diachi);
}
public Khachhang(Khachhang kh)
{
Makh = kh.makh;
TenKH = kh.tenkhachhang;
SDT = kh.sdt;
Diachi = kh.diachi;
}