When I am reading the books I was assuming that this section will be updatable from web pages.

But when I search I don't find any webpage to update the settings specific to that modules.

My questions is that

Can there any webpages which I update those settings?
If not then when the user will have to change settings then he have to change it in web.config.

You are correct in noting that Marco didn't create a front-end UI that would let an administrator alter theBeerSection web.config settings. But you could easily do that if you wanted to. I suspect that's why he put set clauses in the properties.

I would not recommend updating the configuration from inside a web application. Any updates to web.config cause the application to recycle. How often do you need to update those items? I prefer to manually update web.config and test it on my PC. Then I upload it.

Eric

If you manually update it and upload it, it recycles the app as well, so no big difference there.

There are some situations where it might come in handy. Let's say you wanted to change a setting remotely via the web. Or, you wanted to let a colleague do it, without granting him access to the whole web.config file. It would be handy to have an administration console to do that.

That said, it's not an ideal scenario for a lot of situations. For one thing, the code that makes it possible obviously requires High Trust on the server. It wouldn't work with Medium Trust or lower. That would probably present a problem in a shared hosting environment.