kylefritz/log4net-multiple-assemblies — comment on commit 58dfdb6b6e9206c0797cd26e835cb98d66f98320
File:  line 0
By kylefritz:

@ssaporta i made an example of using log4net across assemblies. the webconfig in the executing assembly (yours would be OOS.API) does the configuration. each assembly should have its own Log.cs convenience class. you can follow this lead to add logging to DataLayer.v2011.