.NET framework BETA2

Question

Hello everybody, I have .net framework Beta 2 version installed on my PC. I am trying to use System.Configuration.AppSettingsReader class but everytime it gives me an error "The type or namespace name 'AppSettingsReader' does not exist in the class or namespace 'System.Configuration' " Do I need to install some other patch for the classes added in .Net framework after BETA 2 version or it is something else I am missing ? Thank you C_sharpkid