public void listLoaiSp()
{
cbloaisp.DataSource = loaisp_bus.listLoaiSp();
cbloaisp.DisplayMember = "TENLOAISP";
cbloaisp.ValueMember = "MALOAISP";
}
public void listMaLoaiSp()
{
cbmaloai.DataSource = loaisanpham_bus.listLoaiSp();
cbmaloai.DisplayMember = "MALOAISP";
}