Log4net 1.2.10 running on .NET 1.1 and 2.0 not compatible

I have old code that uses log4net version 1.2.10 targeted for the .NET 1.1 platform. My current code uses lognet version 1.2.10 targeted for the .NET 2.0 platform

When I mix the old and new code all hell breaks loose. Code written today on .NET 4.0 and VS2010 can use the 2.0 log4net dll just fine. but if I put in the 1.1 vers开发者_如何学Pythonion, it breaks. Conversely, the old dlls will break if I use the 2.0 log4net dll.

I do not want to force my old dlls onto 2.0. Is there a good solution? I guess what bugs me most is that the log4net has the same version number, but I cannot fool my code and dlls into working with a single version.

Either a) grab the source and compile log4net to whatever target you want, or b) use ildasm a la this article to change the dependency versions.