wcf can't query sql database

 Hello everyone.  For a day I'm trying to figure out why my application can't get data from sql database when I host wcf service in command line application. All works perfectly when I host  WCF service in Visual Studio Service Host. When I host in command line I'm getting an exception. Intresting is when I call  others wcf methods (which are not query database), then it works in command line application host.