Dynamic log files per WCF operation using log4net

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C#4.0

I have a WCF service with 3 Operations OP1, OP2 & OP3. I'm trying to write 3 different log files(OP1.Log, OP2.Log, OP3.Log) based on the operation called using Log4net.

What I have tried:

<pre><!--<appender name="FileAppender" type="log4net.Appender.FileAppender">
      <file type="log4net.Util.PatternString" value="C:\%property{logName}.log" />

In code I set the

log4net.GlobalContext.Properties["logName"] = operationName; //"OP1 or OP2 
                                         or OP3 based on the operation gets called
            log4net.Config.XmlConfigurator.Configure();
            ILog log = LogManager.GetLogger(typeof(operationName));

When I submit 2 requests OP1(first) & OP2(second) both Log entries goes in to OP1.Log
When I reverse the order

OP2(first) & OP1(second

both Log entries goes in to OP2.Log

I tried using the ThreadContext and no luck. I checked lot of links that has same issue but nothing worked. Appreciated any experts help.