protected void ButtonAdd_Click(object sender, EventArgs e) { ShopHandler a = new ShopHandler(); if (!a.AddNewProductToSystem(TextBoxbarcode.Text.ToString(), TextBoxproductName.Text.ToString(), TextBoxdescription.Text.ToString() , double.Parse(TextBoxprice.Text.ToString()), TextBoxcategories.Text.ToString())) { Labelerrorbarcode.Visible = true; } else { a.AddItemToStore(Session["editshop"].ToString(), TextBoxbarcode.Text.ToString(), int.Parse(TextBoxAmount.Text.ToString())); table1.Visible = false; DropDownList1.SelectedIndex = DropDownList1.Items.IndexOf(DropDownList1.Items.FindByText("Select")); } }