public List<ProductAttr> GetAttrsByCategoryID(string categoryid) { var dal = new ProductsDAL(); DataTable dt = dal.GetAttrsByCategoryID(categoryid); List<ProductAttr> list = new List<ProductAttr>(); foreach (DataRow dr in dt.Rows) { ProductAttr model = new ProductAttr(); model.FillData(dr); list.Add(model); } return list; }