public Category GetCategoryDetailByID(string categoryid)
        {
            var dal = new ProductsDAL();
            DataSet ds = dal.GetCategoryDetailByID(categoryid);

            Category model = new Category();
            if (ds.Tables.Contains("Category") && ds.Tables["Category"].Rows.Count > 0)
            {
                model.FillData(ds.Tables["Category"].Rows[0]);
                List<ProductAttr> salelist = new List<ProductAttr>();
                List<ProductAttr> attrlist = new List<ProductAttr>();

                foreach (DataRow attr in ds.Tables["Attrs"].Rows)
                {

                    ProductAttr modelattr = new ProductAttr();
                    modelattr.FillData(attr);
                    if (modelattr.Type == 1)
                    {
                        attrlist.Add(modelattr);
                    }
                    else if (modelattr.Type == 2)
                    {
                        salelist.Add(modelattr);
                    }
                    modelattr.AttrValues = new List<AttrValue>();
                    foreach (DataRow value in ds.Tables["Values"].Select("AttrID='" + modelattr.AttrID + "'"))
                    {
                        AttrValue valuemodel = new AttrValue();
                        valuemodel.FillData(value);
                        modelattr.AttrValues.Add(valuemodel);
                    }
                }

                model.SaleAttrs = salelist;
                model.AttrLists = attrlist;
            }

            return model;
        }