Microsoft Labs – Some QA would help

I am getting ready  for Microsoft exam 70-569 by going through their on-line learning courses found here.  Last night, I did the lab for 6654.  Things were going great until the last step – where you actually call there WCF Service, which then makes a database call.  I received the following error:

The problem is that the connection string is hard-coded into the supporting class that Microsoft provides and there is no other way to login.  I am surprised Microsoft didn’t QA their applications better.  I am also surprised that no one else hasn’t found this for Microsoft to fix…