private void AddProduct(int productID, int quantity, bool Update) { try { DataRow Item = this.Rows.Find(productID); Item["Quantity"] = quantity + (Update ? 0 : (int)Item["Quantity"]); } catch { String sql = "SELECT ID, Name,Product_Code, Image, Price_Sale," + quantity + " as Quantity_In FROM Product WHERE ID=@ID"; FunctionLibrary.Fill(this, sql, "@ID", productID); } }