private void FormChonSanPham_Load(object sender, EventArgs e)
{
List <SanPhamDTO> sanPhamDTO = new List <SanPhamDTO>();
sanPhamDTO = SanPhamBUS.SelectSanPhamAll();
for (int i = 0; i < sanPhamDTO.Count; i++)
{
dataGridView_ChoSanPham.Rows.Add(i + 1, sanPhamDTO[i].MaSanPham, sanPhamDTO[i].TenSanPham, LoaiSanPhamBUS.SelectLoaiSanPhamById(sanPhamDTO[i].MaLoaiSanPham).TenLoaiSanPham, false);
}
List <LoaiSanPhamDTO> lstcbspDTO = LoaiSanPhamBUS.SelectLoaiSanPhamAll();
LoaiSanPhamDTO all = new LoaiSanPhamDTO();
all.MaLoaiSanPham = "Tất cả";
all.TenLoaiSanPham = "Tất cả";
lstcbspDTO.Insert(0, all);
comboBoxLoaiSanPham.DisplayMember = "TenLoaiSanPham";
comboBoxLoaiSanPham.ValueMember = "TenLoaiSanPham";
comboBoxLoaiSanPham.DataSource = lstcbspDTO;
comboBoxLoaiSanPham.SelectedIndex = 0;
}