I know, this is simple, but I can't seem to remember how to do this in C# and it always takes me a while to find it each time I need it. So maybe a blog entry will help with both?

Microsoft 'replaced' the appSettings section in the web.config file with applicationSettings.  To access the old appSettings properties you would use the following:

string propValue = System.Configuration.ConfigurationManager.AppSettings["property_name"];

To access the newer applicationSettings properties you should use this:

string propValue =  Properties.Settings.Default.property_name;

(The VB equiv is  devKey =  My.Settings.property_name )