this code is a excerpt from the book asp.net all in one reference for dummies on pages 18 and 19. The problem with this is that it doesn't compile. The compiler says txtFirst, txtSecond and lblAnswer are not found in the current context. I am new in this field, could someone please help me out ?\[code\]<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %><!DOCTYPE html PUBLIC