AW.Portal.ProductBrowser.btn_Search_Click C# (CSharp) Метод

        protected void btn_Search_Click(object sender, EventArgs e)
        {
            int tempProdCatID = 0;
            int tempProModID = 0;

            //// to get product id from product name
            if (txt_Category.Text != "")
            {
                EntityManager<ProductCategory> pcat = new EntityManager<ProductCategory>();
                ProductCategory procat = new ProductCategory();
                procat.Name = txt_Category.Text.ToString();
                List<ProductCategory> prodcatID = pcat.Search(procat);
                tempProdCatID = prodcatID[0].ProductCategoryID;
            }
            //// to get model id from model name
            if (txt_ModelName.Text != "")
            {
                EntityManager<ProductModel> pmod = new EntityManager<ProductModel>();
                ProductModel promod = new ProductModel();
                promod.Name = txt_ModelName.Text.ToString();
                List<ProductModel> prodmodID = pmod.Search(promod);
                tempProModID = prodmodID[0].ProductModelID;
            }
            // assigning the search results
            EntityManager<Product> mgrProduct = new EntityManager<Product>();
            Product product = new Product();

            // product.ProductModelID = tempProModID;
            //product.ProductCategoryID = tempProdCatID;
            // if(txt_ProductName.Text != null)
            //product.Name = txt_ProductName.Text.ToString();
            if (txt_ModelName.Text != "")
                product.ProductModelID = tempProModID;// 127;
            if (txt_Category.Text != "")
                product.ProductCategoryID = tempProdCatID;
            if (txt_ProductName.Text != "")
                product.Name = txt_ProductName.Text.ToString();// "Rear Derailleur";

            List<Product> productlist = mgrProduct.Search(product);

            gv_Product.DataSource = productlist;
            gv_Product.DataBind();
        }