fullconfig.xml

<sources>
   <source name="System.Workflow">
      <listeners>
         <add name="System.Workflow" />          
      </listeners>
   </source>
   <source name="System.Workflow.Runtime">
      <listeners>
         <add name="System.Workflow" />
      </listeners>
   </source>
   <source name="System.Workflow.Runtime.Hosting">
      <listeners>
         <add name="System.Workflow" />
      </listeners>
   </source>
   <source name="System.Workflow.Runtime.Tracking">
      <listeners>
         <add name="System.Workflow" />
      </listeners>
   </source>
   <source name="System.Workflow.Activities">
      <listeners>
         <add name="System.Workflow" />
      </listeners>
   </source>
</sources>
<sharedListeners>
   <add name="System.Workflow" 
      type="System.Diagnostics.TextWriterTraceListener" 
      initializeData="c:\logs\System.Workflow.trace.log"  
      traceOutputOptions="DateTime" />
</sharedListeners>
<switches>
   <add name="System.Workflow.Runtime" value="Error" />
   <add name="System.Workflow.Runtime.Hosting" value="Error" />
   <add name="System.Workflow.Runtime.Tracking" value="Error" />
   <add name="System.Workflow.Activities" value="Error" />
   <add name="System.Workflow.Activities.Rules" value="Off" />
</switches>