The name 'lblHelloWorld' does not exist in the current context

Hi,

I am an ASP.NET programmer and I am looking to learn AJAX.NET. The example on this website is however not working.

I have copied the code for the .aspx and the .cs files correctly. However when i run the site i get the following error:

The name 'lblHelloWorld' does not exist in the current context

Any help please?

Thanks in advance