how can i add my custom infomaition

[Johnny]

Hi,
        When I using log4net's AdoAppender,I have a problem, because the
log4net framework default provide logger,logtime,logLevel,message,etc,but I
want to adds extra information like the username, department, etc.so what
can I do? I don’t know how to implement it .can you help me ? thanks very
much.