protected void buttonAdd_Click(object sender, EventArgs e) { if (!string.IsNullOrWhiteSpace(Request.QueryString["id"])) { string clientId = Context.User.Identity.GetUserId(); if (clientId != null) { int id = Convert.ToInt32(Request.QueryString["id"]); int amount = Convert.ToInt32(ddlAmount.SelectedValue); Purchase purchase = new Purchase { Amount = amount, CustomerID = clientId, Date = DateTime.Now, IsInCart = true, ProductID = id }; PurchaseModel model = new PurchaseModel(); lblResult.Text = model.insertPurchase(purchase); System.Diagnostics.Debug.WriteLine(model.insertPurchase(purchase)); } else { lblResult.Text = "Please log in to order items"; } } }