I couldn't figure out what is the problem for this exception.
The type initializer for 'System.Data.SqlClient.SqlConnection' threw an exception
This most likely means that there is an error in your app.config file, e.g. badly formed XML or unexpected elements. The error happens because the static fields inside SqlConnection read from app.config to determine trace detail level as described here: http://msdn.microsoft.com/en-us/library/ms254503.aspx