pers. ref. not new but nice article about appsettings, also the hint to put appsettings in different file is ok (when changed, application doesnt restart)

http://aspalliance.com/820

Using the System.Configuration.ConfigurationSettings.AppSettings["whatever"] and getting the obsolete error message?
System.Configuration.ConfigurationManager.AppSettings["bla"];
add a reference to System.Configuration.dll,