private void frmProduct_Load(object sender, EventArgs e) { List <Product> list = productBus.GetProducts(); List <Supplier> listSupplier = supplierBus.GetSuppliers(); List <ProductCategory> listProductCategory = productCategoryBus.GetProductCategorys(); dgvProduct.DataSource = list; // setting combobox nha cung cap cboNCC.DataSource = listSupplier; cboNCC.DisplayMember = "name"; cboNCC.ValueMember = "id"; // settinig combobox loai cboLoai.DataSource = listProductCategory; cboLoai.DisplayMember = "name"; cboLoai.ValueMember = "id"; }