Yeah you must define the switch.
<!--https://msdn.microsoft.com/en-us/library/ms228993(v=vs.110).aspx--> <sources> <source name="MockSource" switchName="sourceSwitch" switchType="System.Diagnostics.SourceSwitch"> <listeners> <add name="textfileListener" type="System.Diagnostics.TextWriterTraceListener" initializeData="mock.log" /> </listeners> </source> </sources> <switches> <add name="sourceSwitch" value="Verbose"/> </switches> </system.diagnostics> </configuration> Regards Adrian Halid From: ozdotnet-boun...@ozdotnet.com [mailto:ozdotnet-boun...@ozdotnet.com] On Behalf Of Greg Keogh Sent: Friday, 8 January 2016 6:35 AM To: ozDotNet <ozdotnet@ozdotnet.com> Subject: Re: TraceSource and config >From memory you use the Trace class directly Trace.WriteLine("bla bla"); Nah, I don't think so, I'm using a "TraceSource" and all the samples I've seen make a static one, then write to it. public static TraceSource ts = new TraceSource("MySource"); : ts.TraceInformation("Hello world"); Greg