An important step which is often overlooked when beginning the process of mapping your database is to set the Build Action to Embedded Resource. (Buildvorgang – Eingebettete Resource). If you forget to do this you may receive a QuerySynataxException stating that the … is not mapped [from …].
It is also possible to store the mapping files (class.bhm.xml) in the working directory of the program which uses them. However, I personally find it easier to deploy when the mapping files are embedded.