I know it's not officially supported...
This is from internal logging:
log4net: log4net assembly [log4net, Version=1.2.11.0, Culture=neutral,
PublicKeyToken=669e0ddf0bb1aa2a]. Loaded from [c:\Users\El
Tigre\Documents\Visual Studio
2012\Projects\AdministrareRetele\AdministrareRetele\bin\Debug\log4net.dll].
(.NET Runtime [4.0.30319.18033] on Microsoft Windows NT 6.2.9200.0)
log4net: defaultRepositoryType [log4net.Repository.Hierarchy.Hierarchy]
log4net: Creating repository for assembly [AdministrareRetele, Version=1.0.0.0,
Culture=neutral, PublicKeyToken=null]
log4net: Assembly [AdministrareRetele, Version=1.0.0.0, Culture=neutral,
PublicKeyToken=null] Loaded From [c:\Users\El Tigre\Documents\Visual Studio
2012\Projects\AdministrareRetele\AdministrareRetele\bin\Debug\AdministrareRetele.exe]
log4net: Assembly [AdministrareRetele, Version=1.0.0.0, Culture=neutral,
PublicKeyToken=null] does not have a RepositoryAttribute specified.
log4net: Assembly [AdministrareRetele, Version=1.0.0.0, Culture=neutral,
PublicKeyToken=null] using repository [log4net-default-repository] and
repository type [log4net.Repository.Hierarchy.Hierarchy]
log4net: Creating repository [log4net-default-repository] using type
[log4net.Repository.Hierarchy.Hierarchy]
I tried the target framework to 4.0 but it messed up my project