I have updated ClassFromConfig to version 1.2. Now it supports connection strings, e.g if you had
<connectionStrings>
<add name="MyConnection" connectionString="..."/>
</connectionStrings>
in your config, you could access it as follows:
Config.ConnectionStrings.MyConnection
Unfortunately there was a problem in previous releases. It was a "works on my machine" syndrome. Doh! Luckily it was discovered, thanks to Gabriel.

Anyway, check out ClassFromConfig - it'll save you time.