I don't have this assembly in my .net???? I see System.configuration with lower case but no upper case?

System.configuration version 2.0.0

I am trying to get the connection string settings from the app.config. I have added a reference to the above and included the "using System.Configuration" to my class .cs file, but I don't see the System.Configuration.ConnectionStringSettings class. Are there different versions of this .net assembly????

Any ideas?

Mike B