C#.net 2008 debug options

Question

I am trying to determine what to do so that I test the application in debug-test mode and update the test database.  I somehow can not get the correct 'connection string' to point to the test database in debug-test mode. This debug option updates the production daabase.
I have a C#.net 2008 windows application that I just obtained to maintenance. There is no documentation in the code and the people who wrote the application are no longer working for my company to ask any questions to.
 This application has one solution and lots of project files. For me to step through ther code,I need to set the CPU option to X86. This solution has the following debug options, debug, debug-test,debug-production, release, and the configuration manager. In one particular project file, there are configuration files for debug, debug-test,production-test, and release.