system.diagnostics.xml

<system.diagnostics>
   <switches>
      <add name="System.Workflow LogToTraceListeners" value="1" />
      <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>
   <trace autoflush="true">
      <listeners>
         <add name="ConsoleTraceListener" 
            type="System.Diagnostics.ConsoleTraceListener" />
         <add name="TextWriterTraceListener" 
            type="System.Diagnostics.TextWriterTraceListener" 
            initializeData="System.Workflow.Trace.log" 
            traceOutputOptions="DateTime" />
      </listeners>
   </trace>
</system.diagnostics>